JPS54155499A - High dielectric ceramic composite - Google Patents

Abstract

PURPOSE: To obtain a high dielectric porcelain, capable of processing a sintering at low temperature, with a less dielectric loss and an excellent insulation resistance, by constructing a composite of Pb(Fe_1/2Nb_1/2)O₃-Pb(Fe_2/3W_1/3)O₃-Pb(Mg_1/3 Nb_2/3) O₃-Pb(Mn_1/2W_1/2)O₃.

CONSTITUTION: 0.05 to 5.0 wt.% of Pb(Mn_1/2W_1/2)O₃ is added to be contained in a composite being composed of 64.42 to 68.58 wt.% of PbO, 0.61 to 14.21 wt.% of Fe₂O₃, 5.75 to 26.89 wt.% of Nb₂O₅, 0 to 3.92 wt.% of MgO and 0 to 15.62 wt.% of WO₃. For instance, with each oxide compounded so as to provide the above described composition to process a calcination for two hours at temperature of 700 to 850°C, making into a solid phase reactant, after being pulverized, a forming is processed with a caking agent applied, and a firing is finally operated for two hours at temperature of 800 to 1,000°C with a porcelain material obtained. In this way, an addition of accessory ingredient of Pb(Mn_1/2W_1/2)O₃ enhances an insulation resistance and stabilizes a temperature characteristic, simultaneously with a sintering process made capable at low temperature, thus a use of a metal of low melting point like Ag, Ni, Al systems is made capable for embedded internal electrodes.

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