GB881476A - Improvements in or relating to ceramic dielectric materials - Google Patents
Improvements in or relating to ceramic dielectric materialsInfo
- Publication number
- GB881476A GB881476A GB170058A GB170058A GB881476A GB 881476 A GB881476 A GB 881476A GB 170058 A GB170058 A GB 170058A GB 170058 A GB170058 A GB 170058A GB 881476 A GB881476 A GB 881476A
- Authority
- GB
- United Kingdom
- Prior art keywords
- barium
- metaniobate
- lead
- temperature
- prepared
- 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
- C04B35/495—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 vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
- C04B35/497—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 vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates based on solid solutions with lead oxides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
A ferroelectric ceramic material consisting of lead barium metaniobate is prepared from a mixture of powdered monoxide, carbonate or oxalate of lead; oxide, carbonate or oxalate of barium; and inobium pentoxide to give a product of Pb(1-x) Ba(x) Nb2 O6 where x lies between 0,25 and 0,6. The mixture is prepared at a temperature between 850 DEG C. and 1150 DEG C. in a non-reducing atmosphere for 2 or 3 hours, pulverized, compacted, and heated to between 1270 DEG C. and 1320 DEG C. in a non-reducing atmosphere for up to 30 minutes. In one method the lead metaniobate and barium metaniobate are first separately preformed by heating mixtures of the constituent oxides to 850 DEG C. and 1000 DEG C. respectively. In one example Pb0,7 Ba0,3 Nb2 O6 is prepared by heating a mixture of PbO, Nb2 O5 and Ba CO3 in appropriate proportions, with camphor in diethyl ether as a binder, in air. The material is then crushed, pressed into discs, heated up to 1280 DEG C., and cooled slowly. The addition of the barium to lead metaniobate has the effect of reducing the Currie temperature, facilitates formation of silver electrodes, and enables polarization to be carried out at a higher temperature by applying a 20 kv./cm. field to silvered discs in silicone oil at 250 DEG C. The material may be used in accelerometers for use at elevated temperatures, and generation of ultrasonic vibrations. A table is provided giving electrical characteristics of various materials according to the invention, including the electromechanical coupling coefficient in the radial mode and the variation of permittivity with temperature. Specifications 787,352, 812,343 and 828,066 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB170058A GB881476A (en) | 1958-01-17 | 1958-01-17 | Improvements in or relating to ceramic dielectric materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB170058A GB881476A (en) | 1958-01-17 | 1958-01-17 | Improvements in or relating to ceramic dielectric materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB881476A true GB881476A (en) | 1961-11-01 |
Family
ID=9726504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB170058A Expired GB881476A (en) | 1958-01-17 | 1958-01-17 | Improvements in or relating to ceramic dielectric materials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB881476A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3222283A (en) * | 1965-12-07 | Lead barium niobate ceramic composition | ||
DE1214127B (en) * | 1962-04-02 | 1966-04-07 | Gen Electric | Ferroelectric lead niobate ceramic |
-
1958
- 1958-01-17 GB GB170058A patent/GB881476A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3222283A (en) * | 1965-12-07 | Lead barium niobate ceramic composition | ||
DE1214127B (en) * | 1962-04-02 | 1966-04-07 | Gen Electric | Ferroelectric lead niobate ceramic |
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