3PbO・Fe_2O_3・WO_3の反応過程における液相生成

概要

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The liquid-phase formation around 690℃ in the system of 3 PbO・ Fe_2O_3・WO_3 as a raw material of low-temperature-firing PbFe_<2/3>W_<1/3>O_3 was investigated. In DTA a sharp endothermic peak was observed at 690℃ on heating, and an exothermic peak was found at 670℃ on cooling immediately after that endothermic peak. The endothermic peak is interpreted as to be due to the formation of the liquid-phase from a certain intermediate unknown phase, and the exothermic peak on cooling is due to solidification of the liquid-phase. A rapid shrinkage in specimens was observed by TMA, and drastic changes in microstructure were also investigated by SEM and high temperature optical microscopy. A pyrochlore phase formed from the liquid-phase was determined to be Pb : Fe : W〜2 : 1 : 1.
社団法人日本セラミックス協会の論文
1989-02-01