抄録
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.
