PbOとPZTの焼結に関する研究(第7報) : 焼結におよぼす仮焼の影響

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This paper dealt with effects of a wet and a dry method in pulverization on sintering the non-stoichiometric PZT with an excess PbO, the powders containing after 1.0 PbO : 0.48 TiO2 : 0.52ZrO2 (molar ratio) powders were calcined at 600 and 800°C before the sintering. Abnormal expansion was not recognized in specimens of calcined powders. The shrinkage of the specimen calcined at 800°C and treated by the wet method was smaller than that of the others. As a result, it was found that a mechano-chemical reaction between PZT powders and water takes place. For this reason, the sintered density of this specimen was lower up to 900°C. The linear relation holded between crystal grain growth and sintering time, and the slope of which was 0.25-0.28. The electro-mechanical coupling coefficients were 47-50% with regard to the sintered bodies pulverized by the dry method after heving been calcined at 800°C.
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