Combined DTA and Mössbauer Studies of the Fe-S System

Abstract

The mixtures of Fe and S with the atomic ratios Fe:S = 1:1; 1:2, and 2:3 were investigated. It was found that the formation of FeS compound takes place after melting of sulphur in the temperature range from 490 to 590 K. The thermal peak is divided into two subpeaks with maximums at 522 and 576 K. Such shape is formed because simultaneously with the formation of iron sulphides (exothermic peak) crystallographic transitions (endothermic peaks) occur. Mössbauer parameters of the quenched samples allowed attributing the thermal peak at temperatures 590-620 K to formation of FeS2, which at the subsequent heating decomposes on peritectics at 1015 K.