High-temperature phases of pyrophyllite and their evolutionary characteristics

摘要

WITH the increase of heating temperature, phase of pyrophyllite will undergo a series of transformations. Former scholars have done some work in this respect ; the temperature spans, however, were normally not more than 1 150°C and no relatively comprehensive results have been reported. Thus, the features of the phases from indoor temperature to melting point (1 710°C ± ) for pyrophyllite and the entire evolutionary process of the phases are uncertain.