WO2004058638A1 - Procede de production de precurseurs a base de nitrate pour oxydes metalliques et oxocuprates supraconducteurs - Google Patents
Procede de production de precurseurs a base de nitrate pour oxydes metalliques et oxocuprates supraconducteurs Download PDFInfo
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- WO2004058638A1 WO2004058638A1 PCT/EP2003/008861 EP0308861W WO2004058638A1 WO 2004058638 A1 WO2004058638 A1 WO 2004058638A1 EP 0308861 W EP0308861 W EP 0308861W WO 2004058638 A1 WO2004058638 A1 WO 2004058638A1
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- Prior art keywords
- nitrate
- nitrates
- oxide
- multinary
- composition
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002243 precursor Substances 0.000 title claims abstract description 33
- 239000002887 superconductor Substances 0.000 title claims abstract description 28
- 229910002651 NO3 Inorganic materials 0.000 title claims abstract description 22
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 13
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000000203 mixture Substances 0.000 claims abstract description 74
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 150000002823 nitrates Chemical class 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 239000000126 substance Substances 0.000 claims description 13
- 229910052791 calcium Inorganic materials 0.000 claims description 11
- 229910052712 strontium Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical class O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 4
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 229910052701 rubidium Inorganic materials 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 description 17
- 239000000843 powder Substances 0.000 description 15
- 229910052797 bismuth Inorganic materials 0.000 description 13
- 239000013078 crystal Substances 0.000 description 13
- 229910052745 lead Inorganic materials 0.000 description 13
- 238000000137 annealing Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 150000001768 cations Chemical class 0.000 description 6
- 229910017604 nitric acid Inorganic materials 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 4
- 238000013022 venting Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000002447 crystallographic data Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- -1 oxides Chemical class 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G3/00—Compounds of copper
- C01G3/006—Compounds containing, besides copper, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/18—Methods for preparing oxides or hydroxides in general by thermal decomposition of compounds, e.g. of salts or hydroxides
- C01B13/185—Preparing mixtures of oxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/48—Methods for the preparation of nitrates in general
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
- C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
- C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
- C04B35/4525—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide also containing lead oxide
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0772—Processes including the use of non-gaseous precursors
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/77—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by unit-cell parameters, atom positions or structure diagrams
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3213—Strontium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/443—Nitrates or nitrites
Definitions
- the present invention relates to a method for producing defined, reproducible substances which are suitable for producing metal oxides and an oxocuprate superconductor or a nitrate-free precursor for the synthesis of oxocuprate superconductors.
- the materials for the high-temperature superconductors must meet high requirements in terms of chemical purity, homogeneity, the defined phase composition and crystal size as well as reproducibility.
- Some processes for producing precursors for superconductor materials are known.
- EP522575, EP285392 and US5,298,654 describe the co-precipitation of metal compounds dissolved in water, for example nitrates.
- the solutions with oxalic acid become water-insoluble or sparingly soluble .
- Metal oxalate mixtures precipitated.
- mixtures of aqueous salt solutions of the elements which are to be contained in the superconductor are spray dried or subjected to pyrolysis, as in WO89 / 02871, EP371211, EP681989 and DE19505133.
- Another method for producing a one-piece, multinary metal oxide powder is the introduction of a mixture of metal salts and / or metal oxides and / or metals into a pulsation reactor with a pulsating gas flow, as described in WO02 / 072471.
- the object of the present invention is to provide a process for the production of defined, reproducible substances which meet the high requirements for the superconductor materials, do not have the disadvantages of the substances produced by known processes and are therefore suitable for use as precursors for the Synthesis of oxocuprate superconductors or their nitrate-free precursors from nitrates or nitrate solutions are suitable.
- a method in which a nitrogen oxide atmosphere is used.
- This can be achieved, for example, in a nitrogen oxide stream or by using a reaction vessel in that a nitrogen oxide atmosphere is either added from the outside or is generated by stowage of the nitrogen oxides emerging from the mixture.
- the starting batch consists of a) nitric acid solutions of the metal salts (e.g. nitrates, oxides, carbonates) or b) solid oxides and solid nitrates or c) other reactive materials that have already been subjected to pretreatment, e.g. drying or pyrolysis (Fig. 1). Undesired oxidic secondary phases can be converted into desired, defined substances in the nitrogen oxide atmosphere.
- These desired substances which are stable in the multinary powders with the desired composition, could be represented and characterized.
- the crystallographic data of the compounds BiCaO 2 NO 3 , BiSrO 2 N ⁇ 3 , BiBa0 2 NO 3 and BiPbO 2 NO 3 are listed below as examples of such multinary oxide nitrates.
- Figures 2 and 3 show exemplary crystal structures of the compounds BiSrO 2 NO 3 and BiBaO 2 NO 3 .
- Figures 4 and 5 show X-ray diffractograms of the compounds BiSrO 2 N ⁇ 3 and Bi-BaO 2 NO 3 .
- the composition of the oxide nitrate according to the invention is (Bi u , Sr v , Ca w , Pb x ) 2 O 2 ⁇ y (N ⁇ 3) ⁇ ⁇ 2, where ⁇ means that the The number of the respective ions or ion groups with a positive or negative deviation can vary by the given value.
- the phase mixture obtained by the process according to the invention contains Ca, Cu and / or Pb-containing phases, such as Ca 1 ⁇ x Cu ⁇ ⁇ y O z , CuO and Ca 2 PbO 4 .
- the reactions preferably take place in a temperature range between room temperature and 850 ° C., preferably from 500 ° C. to 750 ° C. In principle, however, other temperatures are also conceivable.
- the process according to the invention is therefore distinguished by the targeted formation of stable nitrate-containing precursors which contain the oxide nitrates mentioned, which is brought about by the use of a nitrogen oxide atmosphere.
- the partial pressure of the nitrogen oxides is below 1.5 bar.
- the type and composition of the oxide nitrates according to the invention depends only on the cation composition of the starting materials and not on the above-mentioned starting mixture according to a), b) or c) (Fig. 1).
- the invention encompasses the use of the method described above for the production of a good superconductor.
- the production of a superconductor takes place via the synthesis of a nitrate-free precursor.
- this nitrate-free precursor can, for example, be the compound with the composition Bi 2 ⁇ u Pbo, 3 ⁇ Sr 2
- the superconductor can be produced directly from the precursor according to the invention.
- the oxide nitrates can also be contained in nitrate-containing precursors for numerous oxides or can themselves serve as precursors.
- Starting mixtures which are used according to a), b) or c) and have the desired cation composition are thermally treated in a nitrogen oxide atmosphere and transferred to the nitrate-containing precursor which contains the oxide nitrates according to the invention.
- the oxide nitrates are converted into the corresponding metal oxides (Fig. 1).
- These can be any metal oxides, including superconducting materials such as Bao , 6 Ko , 4 Bi ⁇ 3 .
- Fig. 1 Schematic course of the reaction of the method according to the invention.
- Fig. 2 Crystal structure of BiSrO 2 NO 3 .
- Fig. 3 Crystal structure of BiBaO 2 NO 3 .
- Fig. 4 X-ray diffractogram of BiSrO 2 NO 3 .
- Fig. 5 X-ray diffractogram of BiBaO 2 N ⁇ 3.
- Fig. 6 X-ray diffractogram of the phase mixture after annealing at 660 ° C.
- Fig. 7 X-ray diffractogram of the phase mixture after annealing at 820 ° C.
- Fig. 8 X-ray diffractogram of (Bi, Pb) -2223 after annealing at 850 ° C.
- Fig. 9 Schematic course of the reaction to form (Bi, Pb) -2223.
- Fig. 10 X-ray diffractogram of the phase mixture after annealing at 650 ° C.
- Fig. 11 X-ray diffractogram of (Bi, Pb) -2212 after annealing at 850 ° C.
- Fig. 12 Schematic course of the reaction to form (Bi, Pb) -2212.
- Fig. 13 X-ray diffractogram of the phase mixture after annealing at 650 ° C.
- Fig. 14 X-ray diffractogram of Bi-2212 after annealing at 850 ° C.
- Fig. 15 Schematic course of the reaction to form Bi-2212.
- Fig. 16 X-ray diffractogram of the phase mixture after annealing at 650 ° C.
- Fig. 17 X-ray diffractogram of Bi-2201 after annealing at 850 ° C.
- Fig. 18 Schematic course of the reaction to form Bi-2201.
- the powder which is the nitrate-containing precursor according to the invention, contains the phases (Bi, Pb, Sr, Ca) 2 O 2 NO 3 , Ca 2 PbO 4 , Ca 0 , 8 5CuO 2 and CuO (see Fig. 6) ,
- the temperature is then increased to 820 ° C at a heating rate of 5 ° C / min.
- the mixture is kept at this temperature for 1 h; then the nitrogen oxide atmosphere is slowly broken down by venting the reaction vessel.
- the mixture is held at this temperature for an additional hour and then cooled at a rate of 5 ° C / min.
- This composition (Bi-2212 with secondary phases containing Pb, Ca and Cu) corresponds to the precursor of the high-temperature superconductor (Bi, Pb) -2223.
- the mixture is now pressed into a tablet and this is heated in an oven at a heating rate of 5 ° C / min to 850 ° C.
- the powder now contains the high-temperature superconductor (Bi, Pb) -2223 (see Fig. 8).
- Nitrates and oxides are used as starting materials (e.g. Bi 2 O 3 , PbO, Sr (N03) 2, Ca (NO 3 ) 2 • 4 H 2 O and CuO) and in a closed furnace with pressure relief valve (p ⁇ 1.5 bar) at a heating rate of 5 ° C / min to 660 ° C, so that a nitrogen oxide atmosphere is formed. The mixture is held at this temperature for 15 hours and then cooled at a rate of 5 ° C / min.
- the nitrate-containing precursor according to the invention also forms here; the other reactions correspond to the reaction path described above.
- a mixture of compounds with the cation composition Bi ⁇ , 8 Pbo, 3 3Sr 1 ⁇ 87 Ca ⁇ , oCu 2, oO x is produced.
- Bi (NO 3 ) 3 - 5 H 2 O, PbO, Sr (NO 3 ) 2 , CaCO 3 and CuO are used.
- the powders are weighed out and dissolved in 2N nitric acid HNO 3 .
- the resulting mixture is concentrated on a heating stirrer, dried at 200 ° C. for 2 h and then triturated intimately.
- a closed furnace with a pressure relief valve (p ⁇ 1.5 bar) the mixture is now heated to 650 ° C at a heating rate of 5 ° C / min, so that a nitrogen oxide atmosphere is formed.
- the powder which is the nitrate-containing precursor according to the invention, contains the phases (Bi, Pb, Sr, Ca) 2 O 2 N ⁇ 3 and CuO (see Fig. 10).
- the temperature is then increased to 850 ° C at a heating rate of 5 ° C / min.
- the mixture is kept at this temperature for 1 h; then the nitrogen oxide atmosphere is slowly broken down by venting the reaction vessel.
- the mixture is held at this temperature for 13 hours and then cooled at a rate of 5 ° C / min.
- the product is the high-temperature superconductor (Bi, Pb) -2212 (see Fig. 11).
- Nitrates and oxides eg B Ed 2 O 3 , PbO, Sr (NO 3 ) 2 , Ca (N0 3 ) 2 • 4 H 2 0 and CuO
- Nitrates and oxides are used as starting materials and in a closed furnace with Pressure relief valve (p ⁇ 1.5 bar) heated to 650 ° C at a heating rate of 5 ° C / min, so that a nitrogen oxide atmosphere is formed.
- the mixture is kept at this temperature for 14 hours and then cooled at a rate of 5 ° C./min.
- the nitrate-containing precursor according to the invention also forms here; the other reactions correspond to the reaction path described above.
- a mixture of compounds with the cation composition Bi 2, i 3 Sr ⁇ , 87 Ca ⁇ , oCu2, oO x is produced.
- Bi (NOs) 3-5 H 2 O, Sr (NO 3 ) 2 , CaCO 3 and CuO are used as starting materials.
- the powders are weighed out and dissolved in 2N nitric acid HNO 3 .
- the resulting mixture is concentrated on a heating stirrer, dried at 200 ° C. for 2 hours and then sealed intimately. ben.
- a pressure relief valve p ⁇ 1.5 bar
- the mixture is now heated to 650 ° C at a heating rate of 5 ° C / min, so that a nitrogen oxide atmosphere is formed.
- the mixture is kept at this temperature for 14 h.
- the powder which is the nitrate-containing precursor according to the invention, contains the phases (Bi, Sr, Ca) 2 ⁇ 2 N ⁇ 3 and CuO (see Fig. 13).
- the temperature is then increased to 850 ° C at a heating rate of 5 ° C / min.
- the mixture is kept at this temperature for 1 h; then the nitrogen oxide atmosphere is slowly broken down by venting the reaction vessel.
- the mixture is held at this temperature for 13 hours and then cooled at a rate of 5 ° C / min.
- the product is the high-temperature superconductor Bi- 2212 (see Fig. 14).
- nitrates and oxides are used as starting materials (e.g. Bi 2 ⁇ 3 , Sr (N ⁇ 3 ) 2, Ca (NO 3 ) 2 • 4 H 2 O and CuO) and in a closed furnace with pressure relief valve ( p ⁇ 1.5 bar) at a heating rate of 5 ° C / min to 650 ° C, so that a nitrogen oxide atmosphere is formed.
- the mixture is kept at this temperature for 14 hours and then cooled at a rate of 5 ° C./min.
- the nitrate-containing precursor according to the invention also forms here; the other reactions correspond to the reaction path described above.
- a mixture of compounds with the cation composition Bi 2, oSr 2 ⁇ oCu ⁇ ⁇ oO x is produced.
- Bi (NO 3) 3 - used 5 H 2 O, Sr (NO 3) 2 and CuO.
- the powders are weighed out and dissolved in 2N nitric acid HNO 3 .
- the resulting mixture is concentrated on a heating stirrer, dried at 200 ° C. for 2 h and then triturated intimately.
- a closed furnace with pressure relief valve (p ⁇ 1.5 bar) the mixture is now heated to 650 ° C at a heating rate of 2 ° C / min, so that a nitrogen oxide atmosphere is formed.
- the mixture is 4 h at this temperature held.
- the powder which is the nitrate-containing precursor according to the invention, contains the phases BiSrO 2 NO 3 and CuO (see Fig. 16).
- the temperature is then increased to 850 ° C at a heating rate of 2 ° C / min.
- the mixture is kept at this temperature for 1 h; then the nitrogen oxide atmosphere is slowly broken down by venting the reaction vessel.
- the mixture is kept at this temperature for 4 hours and then cooled at a rate of 5 ° C./min.
- Bi-2201 is available as a product (see Fig. 17).
- Nitrates and oxides e.g. Bi 2 ⁇ 3 , Sr (N0 3 ) 2 and CuO
- a closed furnace with pressure relief valve p ⁇ 1.5 bar
- p ⁇ 1.5 bar pressure relief valve
- the nitrate-containing precursor according to the invention also forms here; the other reactions correspond to the reaction path described above.
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Abstract
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03813873A EP1578690A1 (fr) | 2002-12-23 | 2003-08-09 | Procede de production de precurseurs a base de nitrate pour oxydes metalliques et oxocuprates supraconducteurs |
AU2003253400A AU2003253400A1 (en) | 2002-12-23 | 2003-08-09 | Method for the production of nitrate-containing precursors for metal oxides and oxocuptrate superconductors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10261549.7 | 2002-12-23 | ||
DE10261549 | 2002-12-23 |
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WO2004058638A1 true WO2004058638A1 (fr) | 2004-07-15 |
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PCT/EP2003/008861 WO2004058638A1 (fr) | 2002-12-23 | 2003-08-09 | Procede de production de precurseurs a base de nitrate pour oxydes metalliques et oxocuprates supraconducteurs |
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Country | Link |
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EP (1) | EP1578690A1 (fr) |
AU (1) | AU2003253400A1 (fr) |
WO (1) | WO2004058638A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103429093A (zh) * | 2011-02-18 | 2013-12-04 | 杜邦营养生物科学有限公司 | 饲料添加剂组合物 |
CN104684408B (zh) * | 2012-08-03 | 2018-08-31 | 杜邦营养生物科学有限公司 | 饲料添加剂组合物 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02145761A (ja) * | 1988-11-28 | 1990-06-05 | Matsushita Electric Ind Co Ltd | 薄膜超電導体の製造方法 |
US5039502A (en) * | 1989-02-02 | 1991-08-13 | Hoechst Aktiengesellschaft | Process for the preparation of metal nitrates |
US5122505A (en) * | 1990-10-01 | 1992-06-16 | Sri International | Carbonate-free inorganic nitrates or oxides and process thereof |
US5219829A (en) * | 1990-11-02 | 1993-06-15 | Merck Patent Gesellschaft Mit Beschrankter Haftung | Process and apparatus for the preparation of pulverulent metal oxides for ceramic compositions |
EP0681989A1 (fr) * | 1994-05-13 | 1995-11-15 | MERCK PATENT GmbH | Procédé pour la préparation de poudres d'oxydes métalliques multi éléments |
DE10111938A1 (de) * | 2001-03-13 | 2002-09-26 | Merck Patent Gmbh | Herstellung von Hochtemperatur-Supraleiter-Pulvern in einem Pulsationsreaktor |
-
2003
- 2003-08-09 EP EP03813873A patent/EP1578690A1/fr not_active Withdrawn
- 2003-08-09 AU AU2003253400A patent/AU2003253400A1/en not_active Abandoned
- 2003-08-09 WO PCT/EP2003/008861 patent/WO2004058638A1/fr not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02145761A (ja) * | 1988-11-28 | 1990-06-05 | Matsushita Electric Ind Co Ltd | 薄膜超電導体の製造方法 |
US5039502A (en) * | 1989-02-02 | 1991-08-13 | Hoechst Aktiengesellschaft | Process for the preparation of metal nitrates |
US5122505A (en) * | 1990-10-01 | 1992-06-16 | Sri International | Carbonate-free inorganic nitrates or oxides and process thereof |
US5219829A (en) * | 1990-11-02 | 1993-06-15 | Merck Patent Gesellschaft Mit Beschrankter Haftung | Process and apparatus for the preparation of pulverulent metal oxides for ceramic compositions |
EP0681989A1 (fr) * | 1994-05-13 | 1995-11-15 | MERCK PATENT GmbH | Procédé pour la préparation de poudres d'oxydes métalliques multi éléments |
DE10111938A1 (de) * | 2001-03-13 | 2002-09-26 | Merck Patent Gmbh | Herstellung von Hochtemperatur-Supraleiter-Pulvern in einem Pulsationsreaktor |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 014, no. 390 (C - 0751) 23 August 1990 (1990-08-23) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103429093A (zh) * | 2011-02-18 | 2013-12-04 | 杜邦营养生物科学有限公司 | 饲料添加剂组合物 |
CN104684408B (zh) * | 2012-08-03 | 2018-08-31 | 杜邦营养生物科学有限公司 | 饲料添加剂组合物 |
Also Published As
Publication number | Publication date |
---|---|
EP1578690A1 (fr) | 2005-09-28 |
AU2003253400A1 (en) | 2004-07-22 |
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