EP0237640A2
Expired / Lapsed
EP
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Method for production of ceramic composition
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1986-12-16
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Granted: —
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Expires: 2006-12-16
Abstract
Abstract A ceramic composition represented by the following general formula: (wherein 0<x<l, O<y<l) 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 alkali 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
EP
Data Source
google_patents
Last Synchronized
2026-11-09 23:20
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: 11
Claim 1
Independent Claim
86 words
(I) A method for the production of a ceramic composition represented by the following general formula: (wherein O<x<, O<y<l), comprising the steps of 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 alkali to the resultant system thereby effecting substantially thorough precipitation of lead and lanthanum components, and heating the produced precipitate.
Claim 2
Dependent Claim
15 words
(2) A method according to Claim I, wherein aqua ammonia is used as said alkali.
Claim 3
Dependent Claim
35 words
(3) A method according to Claim I, wherein said heating of said precipitate is carried out at a temperature of not lower than 500°C and not higher than the decomposition temperature of said ceramic composition.
Claim 4
Dependent Claim
35 words
(4) A method according to Claim I, 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
18 words
(5) A method according to Claim I, wherein said titanium alkoxide is a lower alcohol alkoxide of titanium.
Claim 6
Dependent Claim
20 words
(6) A method according to Claim 5, wherein said titanium·alkoxide is titanium methoxide, titanium ethoxide, titanium iso-propoxide, or titanium butoxide.
Claim 7
Dependent Claim
18 words
(7) A method according to Claim I, wherein said zirconium alkoxide is a lower alcohol alkoxide of zirconium.
Claim 8
Dependent Claim
21 words
(8) A method according to claim 7, wherein said zirconium alkoxide is zirconium methoxide, zirconium ethoxide, zirconium iso-propoxide, or zirconium butoxide.
Claim 9
Dependent Claim
49 words
(9) A method accordirig to Claim 1, wherein said aqueous solution containing lead nitrate and/or lead acetate and lanthanum nitrate and/or lanthanum acetate is an aqueous solution containing lead nitrate and/or lead acetate and lanthanum nitrate and/or lanthanum acetate in a total amount of 5 to 40% by weight.
Claim 10
Dependent Claim
33 words
(10) A method according to Claim I, 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 11
Dependent Claim
32 words
(II) A method according to Claim I, wherein said alkali is added in an amount such as to adjust the pH of the reaction system in the range of 7 to II.
References Cited (Backward Citations)
No citation records indexed.
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