Comment@Figure shows first heating and cooling cycle. Sulfidation reaction starts with the melting of Bi and covers over 285-334. Peak @at 291, -180.91J/g.@Phase transition:@600-724ionset 666, peak 713jendothermic@68.57J/g. In cooling stage, peak at 647, -67.11J/g.
The enthalpy of formation@Compound crystalized in the orthorhombic system
Bi2S3. The enthalpy of formation,
’Hf=31.5kcal/mol
