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BaTiO 3 and Ba(Ti,Zr)O 3 dielectric powders have been prepared from submicrometer BaCO 3 , TiO 2 , and ZrO 2 . By use of submicrometer BaCO 3 the intermediate formation of Ba 2 TiO 4 second phase can be widely suppressed. Monophase perovskites of BaTiO 3 were already formed at 900°C and Ba(Ti,Zr)O 3 at 1050°C. Aggregates of very small subgrains could be easily disintegrated to particle sizes <0.5 μm.
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Hennings et al. (2001) studied this question.
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