Patent US4789653A successfully refreshed from Google Patents.
US4789653A
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Method for production of ceramic composition
Assignee: GDI NEWCO Inc A DE CORP
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Filing: 1986-12-02
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Granted: 1988-12-06
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Expires: 2006-12-02
Abstract
Abstract A ceramic composition represented by the following general formula: Pb1-xLax(ZryTi1-y)1-x/4O3 wherein O<x<1, O<y<1) is produced by a method which comprises adding a mixed solution of a titanium alkoxide and a zirconium alkoxide to an aqueous solution containing lead nitrate and/or lead acetate and lanthanum nitrate and/or lanthanum acetate thereby simultaneously effecting hydrolysis of said alkoxides and coprecipitation of lanthanum components, further adding an alkaline substance to the resultant system thereby effecting substantially thorough precipitation of lead and lanthanum components, and heating the produced precipitate.
Inventors
- 👤 Yasuyuki Ogata
- 👤 Hidetsugu Ono
- 👤 Seiji Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; B; B82; B82Y; B82Y30/00; C01; C01G; C01G25/00; C01G25/006; C01P; C01P2004/00; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A method for the production of a ceramic composition represented by the following general formula: Pb.sub.1-x La.sub.x (Zr.sub.y Ti.sub.1-y).sub.1-x/4 O.sub.3 (wherein 0<x<1, 0<y<1), comprising the steps of adding a mixed solution of a titanium alkoxide and a zirconium alkoxide in amounts to satisfy the ratio of the general formula to an aqueous solution containing at least one of lead nitrate and lead acetate and at least one of lanthanum nitrate and lanthanum acetate in amounts to satisfy the ratio of the general formula thereby simultaneously effecting hydrolysis of said alkoxides and coprecipitation of lead and lanthanum components, further adding an alkaline substance to the resultant system to adjust pH thereby effecting substantially thorough precipitation of lead and lanthanum components, and heating the produced precipitate at a temperature of not lower than 500 degrees centigrade and not higher than the decomposition temperature of said ceramic composition.
Claim 2
Independent Claim
145 words
A method for the production of a ceramic composition represented by the following general formula: Pb.sub.1-x La.sub.x (Zr.sub.y Ti.sub.1-y).sub.1-x/4 O.sub.3 (wherein 0<x<1, 0<y<1), comprising the steps of adding a mixed solution of a titanium alkoxide and a zirconium alkoxide in amounts to satisfy the ratio of the general formula to an aqueous solution containing at least one of lead nitrate and lead acetate and at least one of lanthanum nitrate and lanthanum acetate in amounts to satisfy the ratio of the general formula thereby simultaneously effecting hydrolysis of said alkoxides and coprecipitation of lead and lanthanum components, further adding an alkaline substance to the resultant system to adjust pH thereby effecting substantially thorough precipitation of lead and lanthanum components, and heating the produced precipitate at a temperature of not lower than 500 degrees centigrade and not higher than the decomposition temperature of said ceramic composition.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein aqua ammonia is used as said alkaline substance.
Claim 4
Dependent Claim
26 words
A method according to claim 1, wherein the variables x and y in said general formula have values falling in the respective ranges, 0.02≦x≦0.25 and 0.10≦y≦0.90.
Claim 5
Dependent Claim
26 words
A method according to claim 1, wherein said titanium alkoxide is selected from the group consisting of titanium methoxide, titanium ethoxide, titanium iso-propoxide and titanium butoxide.
Claim 6
Dependent Claim
26 words
A method according to claim 1, wherein said zirconium alkoxide is selected from the group consisting of zirconium methoxide, zirconium ethoxide, zirconium iso-propoxide and zirconium butoxide.
Claim 7
Dependent Claim
71 words
A method according to claim 1, wherein said aqueous solution containing at least one of lead nitrate and lead acetate and at least one of lanthanum nitrate and lanthanum acetate is an aqueous solution containing at least one of lead nitrate and lead acetate and at least one of lanthanum nitrate and lanthanum acetate in an amount of 5 to 40% by weight relative to a total amount of the components.
Claim 8
Dependent Claim
33 words
A method according to claim 1, wherein said simultaneous hydrolysis of alkoxides and coprecipitation of lead and lanthanum components is carried out at a temperature in the range of 0° to 100° C.
Claim 9
Dependent Claim
30 words
A method according to claim 1, wherein said alkaline substance is added in an amount to adjust the pH of the reaction system in the range of 7 to 11.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |