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Enthalpies of formation of CdSxSe1–x solid solutions

Published online by Cambridge University Press:  31 January 2011

Fen Xu ,
Xuchu Ma ,
Susan M. Kauzlarich  and
Alexandra Navrotsky
Fen Xu
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
Xuchu Ma
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
Susan M. Kauzlarich
Affiliation:
Department of Chemistry, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
*
a) Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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Abstract

The enthalpies of oxidative drop solution (ΔHds) for a series of CdSxSe1–x samples were obtained by calorimetry in molten 3Na2O·4MoO3 at 975 K. They become more exothermic linearly with increasing S content. The enthalpies of formation from the elements (ΔHf,el) depend linearly on molar ratio of S/(S + Se). This is the first report of thermodynamic properties of CdSxSe1–x solid solutions measured by any direct calorimetric method. The enthalpies of formation at 298 K from the binary chalcogenide end-members (ΔHf,CdM) (M = S, Se) for wurtzite CdSxSe1–x are found to be zero within experimental errors. These results strongly suggest that wurtzite CdS and CdSe form an ideal solid solution, despite a substantial difference in molar volume and anion radius. This implies that size difference affects thermodynamics less strongly when larger and more polarizable anions are mixed in chalcogenides than when cations are mixed in oxides.

Keywords

CalorimetryII-VISemiconducting
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1368 - 1374
Copyright
Copyright © Materials Research Society 2009

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