Phase equilibria, chemistry, and thermodynamics during vaporization of indium selenide

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2100763· OSTI ID:6036952

Srinivasa, R S; Edwards, J G

Vaporization, chemistry in the indium-selenium system was studied by the simultaneous Knudsen effusion and torsion effusion method, by x-ray powder diffraction, and by sealed tube and closed cell methods. Indium sesquiselenide, In/sub 2/Se/sub 3/(s) vaporized incongruently in the range of 1004-1156 K. Above 1042 +- 9 K, it vaporizes by 4In/sub 2/Se/sub 3/(s) = 2In/sub 4/Se/sub 5/(l) + Se/sub 2/(g) and below 1042 +- 9 K, it vaporized by 10/3 In/sub 2/Se/sub 3/(s) = 4/3 In/sub 5/Se/sub 6/(l) + Se/sub 2/(g). Above 1042 +- 9 K, In/sub 4/Se/sub 5/(l) vaporized by 10In/sub 4/Se/sub 5/(1) = 8In/sub 5/Se/sub 6/(1) + Se/sub 2/(g). Finally, In/sub 5/Se/sub 6/(1) vaporized congruently by 4/17 In/sub 5/Se/sub 6/(1) = 10/17 In/sub 2/Se(g) + 7/17 Se/sub 2/(g). Third law values of ..delta..H/sup 0/ (298 K) were 572.0 +- 3.7, 507.6 +- 3.0, 261.8 +- 1.0, and 263.6 +- 1.3 kJ/mol of gas, respectively. The ..delta..H/sup 0/ (298 K) between the states In/sub 2/Se(g) + Se/sub 2/(g) and In/sub 2/Se/sub 3/(s) was 602 +- 3 kJ/mol of In/sub 2/Se/sub 3/. The ..delta..H/sup 0/ (298 K) of formation of In/sub 2/Se(g) was 136 +- 17 kJ/mol. In the temperature-pressure-composition phase diagram an invariant point at 1042 +- 9 K was observed. Trends in the vaporization of indium and gallium chalcogenides are described. Similarities between the vaporization behavior of In/sub 2/Se/sub 3/(s) and Ga/sub 2/S/sub 3/(s) are noted and discussed.

• Research Organization: Dept. of Chemistry, The Univ. of Toledo, Toledo, OH 43606
• OSTI ID: 6036952
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 134:7; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DIFFRACTION
EVAPORATION
FLUID FLOW
GALLIUM COMPOUNDS
GALLIUM SELENIDES
GAS FLOW
INDIUM COMPOUNDS
INDIUM SELENIDES
KINETICS
KNUDSEN FLOW
PHASE TRANSFORMATIONS
PRESSURE EFFECTS
REACTION KINETICS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
THERMODYNAMICS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
YIELDS