High dielectric constant type ceramic composition

Details High dielectric constant type ceramic composition High dielectric constant type ceramic composition

H - Electricity

01

B

31/196

H01B 3/12 (2006.01) C04B 35/499 (2006.01) H01G 4/12 (2006.01)

Patent

CA 1108842

- 42 - HIGH DIELECTRIC CONSTANT TYPE CERAMIC COMPOSITION ABSTRACT OF THE DISCLOSURE A basic ceramic composition of high dielectric constant type ceramic composition comprises from 68.67 to 69.19% of PbO, from 3.67 to 4.09% of MgO, from 24.17 to 26.99% of Nb2O5 and from 0.25 to 24.17% of Tio2 , all percentages being by weight. Modified composition may comprise additive of Pb(Mn2/3W1/3)O3 , Pb(Mn1/3Nb2/3)O3 , Pb(Mn1/3Ta2/3)O3 , Pb(Mn1/2W1/2)O3 , MnO, and MgO. Modified composition may comprise Ba, Sr and Ca, which replace Pb of the basic ceramic composition. In a modified composition, the content of B site elements may be larger than that of A site element of an ABO3 crystal of the high dielectric constant type ceramic composition. A high dielectric constant, low dielectric loss, low temperature dependence of capacitance, high insulation resistance and a low sintering temperature are provided by the ceramic com- positions of the present invention.

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