Liquid-Phase Formation in the Reaction Process of 3Pbo.Fe2O3.Wo3
Resource
Journal of the Ceramic Society of Japan, v.97 n.2, p.119-24
Journal
Journal of the Ceramic Society of Japan
Journal Volume
v.97 n.2
Pages
119-24
Date Issued
1990
Date
1990
Author(s)
Abstract
The liquid-phase formation around 690°C in the system of 3PbO⋅Fe2O3⋅WO3 as a raw material of low-temperature-firing PbFe2/3W1/3O3 was investigated. In DTA a sharp endothermic peak was observed at 690°C on heating, and an exothermic peak was found at 670°C 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 SFM and high temperature optical microscopy. A pyrochlore phase formed from the liquid-phase was determined to be Pb:Fe:W≈2:1:1.
Type
journal article