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BaTiO3 has been sintered at 1000-1100°C for periods from 1/6 to 2 hours with 10-20 wt% glass of 74mole% Bi2O3 - 26% B2O3 composition. The resulting composites, consisting of BaTiO3 grains surrounded by a glass, show ϵRT=1300-1500 and ϵmax=2500. The Curie temperature is nearly unaffected by the amount of the glass content.
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Chowdary et al. (1981) studied this question.
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