Vaporization chemistry and thermodynamics of the lead-indium-sulfur system by computer-automated Knudsen and torsion effusion methods

Article abstract of DOI:10.1063/1.440129

Vaporization of PbIn2S4(s) was studied by computer-autometed simultaneous Knudsen and dynamic torsion effusion.Vapor pressures and the apparent molecular weight of the effusing vapor were displayed in real time.The vaporization reaction was PbIn2S4(s)=In2S3(s)+PbS(g).The vapor pressure was measured 108 times in the temperature range 948-1086 K.For the vaporization reaction, third-law analyses gave ΔH deg (298 K)=253.0+/-0.1 kJ/mol.The enthalpy of PbIn2S4(s) with respect to its contituents PbS(s) and In2S3(s) was -23+/-4 kJ/mol.The apparent molecular weight showed stoichiometry changes in indium sulfide during the experiment.Residual indium sulfide, remaining after loss of all PbS, vaporized with some nonstoichiometry by In2S3(s)=In2S(g)+S2(g).The vapor pressure of the residual indium was measured 57 times in the temperature range 1035-1121 K; third-law analyses yielded ΔH deg(298 K)=613.4+/-0.4 kJ/mol for the dissociative vaporization reaction.The compound Pb2In6S11(s), found at lower temperatures, had negligible stability at the temperatures of this investigation.The unit cell of PbIn2S4(s) was orthorhombic with a=2.275 nm, b=1.356 nm, and c=1.953 nm.

Full text of DOI:10.1063/1.440129

Vaporization chemistry and thermodynamics of the lead–indium–sulfur system by
computerautomated Knudsen and torsion effusion methods
Reza Haque, Alfred S. Gates, and Jimmie G. Edwards
Citation: The Journal of Chemical Physics 73, 6301 (1980); doi: 10.1063/1.440129
View online: http://dx.doi.org/10.1063/1.440129
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/73/12?ver=pdfcov
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This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56

This article is copyrighted as indicated in the abstract. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 35.8.11.2
On: Thu, 28 Nov 2013 11:04:56