Title

Partial Pressures for Several In-Se Compositions from Optical Absorbance of the Vapor

Document Type

Article

Publication Date

10-2002

Publisher

Springer

Source Publication

Journal of Phase Equilibria

Source ISSN

1054-9714

Abstract

The optical absorbance of the vapor phase over various In-Se compositions between 33.3–60.99 at.% Se and 673–1418 K was measured and used to obtain the partial pressures of Se2(g) and In2Se(g). The results are in agreement with silica Bourdon gauge measurements for compositions between 50–61 at.%, but significantly higher than those from Knudsen cell and simultaneous Knudsen-torsion cell measurements. It is found that 60.99 at.% Se lies outside the sesquiselenide homogeneity range and 59.98 at.% Se lies inside and is the congruently melting composition. The Gibbs energy of formation of the liquid from its pure liquid elements between 1000–1300 K is essentially independent of temperature and falls between −36 to −38 kJ per g atomic weight for 50 and 56% Se at 1200 and 1300 K.

Comments

Journal of Phase Equilibria, Vol. 23, No. 5 (October 2002): 397-408. DOI.

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