A new atmospheric-gas firing process is demonstrated to be effective for the densification of semiconducting (Ba, Sr)TiO3 ceramics having a positive temperature coefficient of resistivity (PTCR). In the new atmospheric-gas firing process, oxygen atmosphere is introduced in the heating stage of the former reduction-reoxidation firing. Thereby the density of ceramics was increased to 97% from 91%. The optimum Mn concentration for a capacitive varistor increased to 0.20 atm% from 0.11 atm% compared to previous samples with porous ceramic bodies.
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Tashiro et al. (1996) studied this question.
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