US5232880A
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Method for production of nonreducible dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1992-01-09
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Granted: 1993-08-03
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Expires: 2012-01-09
Abstract
Abstract A nonreducible dielectric ceramic composition of a system, (A 1-x R x ) y BO 3 , is prepared by preparing a slurry containing at least one compound selected from the group consisting of carbonates and hydroxides of Ba, Sr, Ca and Mg, at least one compound selected from the group consisting of carbonates and hydroxides of rare earth elements R, and at least one compound selected from the group consisting of oxides, carbonates and hydroxides of Ti, Zr and Sn; filtering the resulting slurry; washing the filter cake with water and calcining the resulting washed cake.
Inventors
- 👤 Nobuyuki Wada
- 👤 Yoshiaki Kohno
- 👤 Shozo Kojima
- 👤 Syunsuke Nakaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H01G4/1236
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
196 words
A non-reducible dielectric ceramic composition of a perovskite structure expressed by the general formula: (A.sub.1-x R.sub.x).sub.y BO.sub.3 wherein A is at least one element selected from the group consisted of Ba, Sr, Ca and Mg, R is at least one rare earth element, and B is at least one element selected from the group consisting of Ti, Zr and Sn, and wherein x and y take respective values in the following ranges: 0.001≦x≦0.020, 1.002≦y≦1.03, said composition being produced by a method comprising the steps of (a) precipitating either at least one carbonate or at least on hydroxide of element A by liquid phase reaction to prepare a slurry A; (b) precipitating either at least one carbonate or at least one hydroxide of rare earth element R by liquid phase reaction to prepare a slurry R; (c) preparing a slurry B containing at least one compound selected from the group consisting of oxides, carbonates and hydroxides of Ti, Zr and Sn; (d) mixing said slurries A, R and B to prepare a mixed slurry; (e) filtering the mixed slurry to form a filter cake; (f) washing the filter cake with water; and (g) calcining the washed cake.
Claim 2
Dependent Claim
196 words
A non-reducible dielectric ceramic composition of a perovskite structure expressed by the general formula: (A.sub.1-x R.sub.x).sub.y BO.sub.3 wherein A is at least one element selected from the group consisted of Ba, Sr, Ca and Mg, R is at least one rare earth element, and B is at least one element selected from the group consisting of Ti, Zr and Sn, and wherein x and y take respective values in the following ranges: 0.001≦x≦0.020, 1.002≦y≦1.03, said composition being produced by a method comprising the steps of (a) precipitating either at least one carbonate or at least on hydroxide of element A by liquid phase reaction to prepare a slurry A; (b) precipitating either at least one carbonate or at least one hydroxide of rare earth element R by liquid phase reaction to prepare a slurry R; (c) preparing a slurry B containing at least one compound selected from the group consisting of oxides, carbonates and hydroxides of Ti, Zr and Sn; (d) mixing said slurries A, R and B to prepare a mixed slurry; (e) filtering the mixed slurry to form a filter cake; (f) washing the filter cake with water; and (g) calcining the washed cake.
Claim 3
Dependent Claim
58 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry A is prepared by adding an aqueous solution of a compound selected from the group consisting of alkali carbonates, alkali hydroxides and amines to an aqueous solution of at least one salt of element A to precipitate at least one carbonate or hydroxide of element A.
Claim 4
Dependent Claim
31 words
The nonreducible dielectric ceramic composition according to claim 2, wherein said at least one salt of element A is selected from the group consisting of nitrates, chlorides, iodides, fluorides and carboxylates.
Claim 5
Dependent Claim
27 words
The nonreducible dielectric ceramic composition according to claim 2, wherein said alkali hydroxides are selected from the group consisting of sodium hydroxide, potassium hydroxide and ammonium hydroxide.
Claim 6
Dependent Claim
27 words
The nonreducible dielectric ceramic composition according to claim 2, wherein said amines are selected from the group consisting of isopropyl amines, ethyl amines, propylamines, 3-ethoxy-propylamine and 3-methoxypropylamine.
Claim 7
Dependent Claim
64 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry R is prepared by addition of an aqueous solution of a compound selected from the group consisting of alkali carbonates, alkali hydroxides and amines to an aqueous solution of at least one salt of rare earth element R to precipitate either at least one carbonate or hydroxide of rare earth element R.
Claim 8
Dependent Claim
34 words
The nonreducible dielectric ceramic composition according to claim 6, wherein said at least one water-soluble salt of rare earth element R is selected from the group consisting of nitrates, chlorides, iodides, fluorides and carboxylates.
Claim 9
Dependent Claim
26 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry B is prepared by dispersing at least one oxide of element B in water.
Claim 10
Dependent Claim
61 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry B is prepared by adding an aqueous solution of a compound selected from the group consisting of alkali carbonates, alkali hydroxides and amines to an aqueous solution of at least one salt of said element B to precipitate at least one carbonate or hydroxide of Ti, Zr or Sn.
Claim 11
Dependent Claim
31 words
The nonreducible dielectric ceramic composition according to claim 9, wherein said at least one salt of element B is selected from the group consisting of nitrates, chlorides, iodides, fluorides and carboxylates.
Claim 12
Dependent Claim
71 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry A is prepared by adding an aqueous solution of an alkali carbonate to an aqueous solution of at least one inorganic salt of Ba, Sr, Ca and Mg, and wherein said slurry R is prepared by adding an aqueous solution of an alkali carbonate to an aqueous solution of at least one inorganic salt of rare earth element R.
Claim 13
Dependent Claim
40 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry R is prepared simultaneously with said slurry A by adding an aqueous solution of an alkali carbonate to an aqueous solution containing ions of elements A and R.
Claim 14
Dependent Claim
40 words
The nonreducible dielectric ceramic composition according to claim 1, wherein said slurry R is prepared simultaneously with said slurry B by adding an aqueous solution of an alkali carbonate to an aqueous solution containing ions of elements R and B.
References Cited (Backward Citations)
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