スピネル型Fe_3S_4の水熱合成に関する注意  [in Japanese] On the Hydrothermal Synthesis of Fe_3S_4 of Spinel Type  [in Japanese]

A hydrothermal process of iron sulfide gives rise to greigite (Fd3m), pyrite (Pa3) and mackinawite (P4/nmm), as the case may be. Greigite is blended with pyrite, when autoclave for the hydrothermal process is cooled down slowly from 192°C to room temperature. Greigite and pyrite here form partially a solid solution. A mixture consisting of greigite and mackinawite appears in the hydrothermal process below 192°C. Pure greigite is produced by means of rapid quenching of the autoclave from 192° to 10°C. 4 figs, 1 table, 5 refs.