Journal of Phase Equilibria

, 23:397 | Cite as

Partial pressures for several In-Se compositions from optical absorbance of the vapor

  • R. F. Brebrick
  • Ching-Hua Su
Basic And Applied Research
Received:
Revised:

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.

Keywords

Partial Pressure Optical Path Optical Absorbance Optical Cell Vapor Species 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© ASM International 2002

Authors and Affiliations

  • R. F. Brebrick
    • 1
  • Ching-Hua Su
    • 2
  1. 1.Materials Science and Engineering Program, College of EngineeringMarquette UniversityMilwaukee
  2. 2.Microgravity Science and Applications Department SD47, Science Directorate, National Aeronautics and Space AdministrationMarshall Space Flight CenterHuntsville

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