GB815676A - Improvements in or relating to ferromagnetic ferrite materials - Google Patents
Improvements in or relating to ferromagnetic ferrite materialsInfo
- Publication number
- GB815676A GB815676A GB986057A GB986057A GB815676A GB 815676 A GB815676 A GB 815676A GB 986057 A GB986057 A GB 986057A GB 986057 A GB986057 A GB 986057A GB 815676 A GB815676 A GB 815676A
- Authority
- GB
- United Kingdom
- Prior art keywords
- values
- oxides
- materials
- lithium
- slightly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- C04B35/26—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 ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2616—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing lithium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
815,676. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 26, 1957 [March 29, 1956], No. 9860/57. Class 38 (2). A ferromagnetic ferrite having a low-temperaturecoefficient of initial permeability in the range 20-50‹ C. can be represented by the formula Co x [(Li¢Fe<SP>3</SP>¢) y Zn (1-y) ] (1-x) Fe 2 O 4 , wherein 0.3 #y# 1.0 and for y = 0.5, x lies between 0.01 and 0.05, for y = 1.0, x lies between 0.001 and 0.004 and for values of y over the ranges 0.3 to 1.0 the minimum and maximum values of x may be obtained by appropriate extrapolation or interpolation. The presence of the cobalt also results in slightly reduced values of tan # and improved performance with changes of temperature of a magnetostriction vibrator incorporating the material. To make the ferrite, a mixture of oxides of the constituent metals, or of compounds which convert to oxides upon heating, or of such materials partially reacted together, is sintered at 900-1200‹ C. to form a material having a density of 3-5 gms./cc. To avoid the escape of lithium as Li 2 O 2 , one starting material may be LiFeO 2 obtained by heating lithium carbonate with α-Fe 2 O 3 at 700‹ C. or with Y-Fe 2 O 3 at 400-500‹ C., or the materials from which the LiFeO 2 is formed may be mixed with the other oxides or compounds. The lithium may, at starting, be slightly in excess in the proper amount of Fe 2 O 3 to offset its evaporation. A table is given showing various magnetic properties exhibited by a range of materials both within and without the invention, obtained by giving x different values when y = 1.0 and 0.5, and with slightly different conditions of production.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL205958A NL89846C (en) | 1956-03-29 | 1956-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB815676A true GB815676A (en) | 1959-07-01 |
Family
ID=19750753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB986057A Expired GB815676A (en) | 1956-03-29 | 1957-03-26 | Improvements in or relating to ferromagnetic ferrite materials |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE556179A (en) |
| CH (1) | CH369834A (en) |
| DE (1) | DE1063953B (en) |
| FR (1) | FR1173386A (en) |
| GB (1) | GB815676A (en) |
| NL (1) | NL89846C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3093588A (en) * | 1960-04-04 | 1963-06-11 | Ampex | Lithium ferrites |
-
1956
- 1956-03-29 NL NL205958A patent/NL89846C/xx active
-
1957
- 1957-03-26 DE DEN13464A patent/DE1063953B/en active Pending
- 1957-03-26 GB GB986057A patent/GB815676A/en not_active Expired
- 1957-03-27 CH CH4429957A patent/CH369834A/en unknown
- 1957-03-27 BE BE556179D patent/BE556179A/xx unknown
- 1957-03-27 FR FR1173386D patent/FR1173386A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH369834A (en) | 1963-06-15 |
| NL89846C (en) | 1959-01-15 |
| BE556179A (en) | 1957-09-27 |
| FR1173386A (en) | 1959-02-24 |
| DE1063953B (en) | 1959-08-20 |
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