Thermodynamic Study of Tin Sulfide and Lead Sulfide Using a Mass Spectrometer

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Abstract
A mass‐spectrometric investigation of the vapor in equilibrium with solid SnS, solid PbS, and a mixture of SnS and PbS has yielded the following reaction enthalpies: SnS(s)→SnS(g)ΔH2980=52.6±1.6 kcal/mole2SnS(s)→Sn2S2(g)56.5±5.0PbS(s)→PbS(g)55.7±1.62PbS(s)→Pb2S2(g)66.6±5.0      PbS(g)→Pb(g)+12S2(g)28.8±2.6Sn2S2(g)→2SnS(g)48.7±5.0Pb2S2(g)→2PbS(g)44.8±5.0      SnPbS2(g)→SnS(g)+PbS(g)46.5±5.0. The dissociation energies of gaseous SnS and PbS were determined to be D00(SnS) = 110.1±3.0 kcal/mole, D00(PbS) = 79.1±2.8 kcal/mole and are compared with the spectroscopically determined values.

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