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Cog dielectric with high K

  • US 5,238,673 A
  • Filed: 05/26/1992
  • Issued: 08/24/1993
  • Est. Priority Date: 11/16/1990
  • Status: Expired due to Term
First Claim
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1. A process for preparing finely divided particles of a composition consisting essentially of:

  • (a) 60.0-70.0 mol % TiO2 ;

    (b) 14.3-20.0 mol % Nd2 O3 ;

    (c) 11.0-16.7 mol % BaO;

    (d) 1.0-8.0 mol % ZrO2 ; and

    (e) 0.05-0.30 mol % CeO2.comprising the steps of;

    (a) admixing a chelating solution comprising a chelating agent and solvent with metal compounds TiXn, NdXn, ZrXn and CeXn wherein each X is independently selected from the group consisting of HCO2 --, CH3 CO2 --, - OH, -OR, - NO3 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 Ba2+, 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.

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