Patent US5238673A successfully refreshed from Google Patents.
US5238673A
Expired / Lapsed
US
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Cog dielectric with high K
Assignee: EIDP Inc
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Filing: 1992-05-26
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Granted: 1993-08-24
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Expires: 2012-05-26
Abstract
Abstract A composition consisting essentially of 60.0-70.0 mol % TiO2, 14.3-20.0 mol % Nd2O3, 11.0-16.7 mol % BaO, 1.0-8.0 mol % ZrO2 and 0.05-0.30 mol % CeO2. This composition is useful for forming densified ceramic dielectric bodies having a dielectric constant of at least 65 and which meet COG specifications, and multilayer capacitors that contain such dielectric bodies.
Inventors
- 👤 Salvatore A. Bruno
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
A process for preparing finely divided particles of a composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 . comprising the steps of: (a) admixing a chelating solution comprising a chelating agent and solvent with metal compounds TiX n , NdX n , ZrX n and CeX n wherein each X is independently selected from the group consisting of HCO 2 --, CH 3 CO 2 --, - OH, -OR, - NO 3 and - Cl, R is alkyl, and n is 3 or 4; (b) mixing in a high turbulence energy environment the metal chelate admixture and an alkaline solution containing Ba 2+ , the pH of the resultant mixture being greater than 11; (c) heating the product of step (b) at 90°-105° C. for at least 3 hours; (d) isolating, washing and drying the metal oxide product of step (c); (e) granulating and calcining the resultant powder at a temperature in the range of 850°-1150° C.
Claim 2
Dependent Claim
188 words
A process for preparing finely divided particles of a composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 . comprising the steps of: (a) admixing a chelating solution comprising a chelating agent and solvent with metal compounds TiX n , NdX n , ZrX n and CeX n wherein each X is independently selected from the group consisting of HCO 2 --, CH 3 CO 2 --, - OH, -OR, - NO 3 and - Cl, R is alkyl, and n is 3 or 4; (b) mixing in a high turbulence energy environment the metal chelate admixture and an alkaline solution containing Ba 2+ , the pH of the resultant mixture being greater than 11; (c) heating the product of step (b) at 90°-105° C. for at least 3 hours; (d) isolating, washing and drying the metal oxide product of step (c); (e) granulating and calcining the resultant powder at a temperature in the range of 850°-1150° C.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the chelating agent consists essentially of alpha-hydroxycarboxylic acids and alphaaminocarboxylic acids.
Claim 4
Dependent Claim
30 words
The process of claim 2 wherein the chelating agent is selected from the group consisting of lactic acid, glycolic acid, malic acid, citric acid, ethylene diamine tetracetic acid and glycine.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the solvent consists essentially of deionized water, and mixtures of deionized water with methanol, ethanol, isopropanol, or acetic acid.
Claim 6
Dependent Claim
173 words
A process for preparing finely divided particles of a composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 . said process comprising the steps of: (a) admixing an aqueous solvent with metal compounds Ti(OCl) 2 , Zr(OCl) 2 , NdNO 3 and CeNO 3 ; (b) mixing in a high turbulence energy environment the metal admixture of step (a) and an alkaline solution containing Ba 2+ , the pH of the resultant slurry being in the range of 1-3; (c) adding sufficient base to the slurry of step (b) to raise the pH to greater than 11, thereby precipitating product; (d) heating the product of step (c) at 90°-105° C. for at least 3 hours; (e) isolating the metal oxide product of step (d); (f) calcining at a temperature in the range of 850°-1150° C. and granulating the isolated product from step (e).
Claim 7
Dependent Claim
173 words
A process for preparing finely divided particles of a composition consisting essentially of: (a) 60.0-70.0 mol % TiO 2 ; (b) 14.3-20.0 mol % Nd 2 O 3 ; (c) 11.0-16.7 mol % BaO; (d) 1.0-8.0 mol % ZrO 2 ; and (e) 0.05-0.30 mol % CeO 2 . said process comprising the steps of: (a) admixing an aqueous solvent with metal compounds Ti(OCl) 2 , Zr(OCl) 2 , NdNO 3 and CeNO 3 ; (b) mixing in a high turbulence energy environment the metal admixture of step (a) and an alkaline solution containing Ba 2+ , the pH of the resultant slurry being in the range of 1-3; (c) adding sufficient base to the slurry of step (b) to raise the pH to greater than 11, thereby precipitating product; (d) heating the product of step (c) at 90°-105° C. for at least 3 hours; (e) isolating the metal oxide product of step (d); (f) calcining at a temperature in the range of 850°-1150° C. and granulating the isolated product from step (e).
Claim 8
Dependent Claim
25 words
The process of claim 5 wherein the solvent consists essentially of deionized water, and mixtures of deionized water with methanol, ethanol, isopropanol, or acetic acid.
References Cited (Backward Citations)
US5116790A
Cited
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