Comment
Figure shows first heating and cooling processes. Sulfidation reaction covers over 652-800Ž. One exothermic peak: at onset@670Ž, peak@724Ž,@-1119.5J/g. No phase transition peak in the cooling cycle. Sudden curvature change less than 200Ž arises from the failare of temperature control. Cooling system didn't catched up.@
The enthalpy of formation@
If all the products are B2S3, the enthalpy of formation @ƒ’H becomes 34.4Kcal/mol (XRD)