BaTiO_3磁器の微構造並びに分域構造と誘電特性について

概要

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For most practical applications polycrystalline barium titanate ceramics are more impor-tant than those of single crystal, and recently, some efforts have been made to explain the phenomena concerning the microstructure of polycrystalline materials, for the purpose of finding out the method of preparation which guarantees good reproducible properties. Micro- and domain structures of the specimens, whose mole ratios BaO/Ti0_2 varies from 0.990 : 1000 to 1.020 1.000,and fired at the temperatures ranging from 1350〜1460℃, were polished and etched by the techniques suitable for the polycrystalline titanates, and were examined under microscope. The results obtained are summarized as follows : ( I ) Barium titanate ceramics containing excess BaO have fine grain structure with an increase in nunrber of void. The specimens fired up to 1460℃ and cooled slowly gave an extrmely coarse-grain structure. ( 2 ) Excess Ti0_2 was found to be more effective than BaO for the grain growth, pro-bably, by the mineralizing action of the former. ( 3 ) Domain structure of barium titanate ceramics assumed many forms, in which, square net and herrung bone pattern were most distinguished, and the former was more flequently observed in the specimens containing excess of Ti0_2. [Received February 20,1962]
社団法人日本セラミックス協会の論文
1962-08-01