Comment
Figure shows first heating and cooling cycle. Sulfidation temperature range covers 187-478Ž. Temperatures of endothermic peaks due to phase transitions are 645,666,698,and 768Ž. Corresponding exothermic peaks appear at 717,661,649,and 635Ž. Melting of In, at 156Ž. The enthalpy of reaction is ƒ’H‚’=863.7J/g.
The enthalpy of formation
@Product is an orthorhombic InS. Small amount of monoclinic In6S7 is coexisted.
The enthalpy of formation, ƒ’Hf=30.3Kcal/mol