GB931597A - Improvements in or relating to resistors - Google Patents
Improvements in or relating to resistorsInfo
- Publication number
- GB931597A GB931597A GB4242759A GB4242759A GB931597A GB 931597 A GB931597 A GB 931597A GB 4242759 A GB4242759 A GB 4242759A GB 4242759 A GB4242759 A GB 4242759A GB 931597 A GB931597 A GB 931597A
- Authority
- GB
- United Kingdom
- Prior art keywords
- antimony
- resistance
- dec
- maximum
- hours
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/022—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances
- H01C7/023—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances containing oxides or oxidic compounds, e.g. ferrites
- H01C7/025—Perovskites, e.g. titanates
-
- 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
- C04B35/46—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 titanium oxides or titanates
- C04B35/462—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 titanium oxides or titanates based on titanates
- C04B35/465—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
- C04B35/4682—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Non-Adjustable Resistors (AREA)
- Conductive Materials (AREA)
Abstract
931,597. Semi-conductor devices. SIEMENS & HALSKE A.G. Dec. 14, 1959 [Dec. 17, 1958], No. 42427/59. Class 37. A high positive temperature coefficient resistor comprises a ceramic of Perovskite structure including barium and titanium as major constituents and antimony as a doping material, the proportion of antimony being such as to produce a ratio of the maximum resistance to the resistance at the Curie temperature which is at least 90% of the highest magnitude obtainable by doping with antimony. Where the basic ceramic material is of the formula (Ba x Sr 1 - x )TiO 3 the quantity of antimony required to produce a maximum value of the maximum resistance ratio varies with the value of x as shown in Fig. 2, although the maximum value itself is substantially independent of x. An exemplary material with a positive temperature coefficient of resistance over the range 0-100‹ C. is made by mixing antimony oxide, barium carbonate, strontium carbonate and titanium dioxide in the molecular proportions 0.005: 0.6: 0.4:1, 1, heating the mix at a rate of 300‹ C. per hour to 1000‹ C., maintaining at 1000‹ C. for 2 hours, and then cooling to 500‹ C. in 3 hours. The resulting product is ground to a fine powder which is pressed into shape and sintered in an oxidising atmosphere at 1360‹ C. for 10 minutes, and subsequently cooled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES0061023 | 1958-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB931597A true GB931597A (en) | 1963-07-17 |
Family
ID=7494565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4242759A Expired GB931597A (en) | 1958-12-17 | 1959-12-14 | Improvements in or relating to resistors |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1415430B2 (en) |
| FR (1) | FR1234479A (en) |
| GB (1) | GB931597A (en) |
| NL (1) | NL245159A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1913960C3 (en) * | 1969-03-14 | 1983-01-20 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka | Method for producing a PTC thermistor element |
| JPS5220291A (en) * | 1975-08-08 | 1977-02-16 | Tdk Corp | Semiconductor porcelain composition |
| DE3019098C2 (en) * | 1980-05-19 | 1983-02-10 | Siemens AG, 1000 Berlin und 8000 München | Ceramic PTC thermistor material and process for its manufacture |
-
0
- NL NL245159D patent/NL245159A/xx unknown
-
1958
- 1958-12-17 DE DE19581415430 patent/DE1415430B2/en active Pending
-
1959
- 1959-08-31 FR FR803922A patent/FR1234479A/en not_active Expired
- 1959-12-14 GB GB4242759A patent/GB931597A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1415430B2 (en) | 1972-02-10 |
| FR1234479A (en) | 1960-10-17 |
| DE1415430A1 (en) | 1969-03-13 |
| NL245159A (en) |
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