Vapor Pressure Scanning of Nonstoichiometry in CdTe

✍ Scribed by J.H. Greenberg; V.N. Guskov; V.B. Lazarev; O.V. Shebershneva

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 279 KB
• Volume: 102
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1049

✦ Synopsis

Results of vapor pressure scanning of the cadmium telluride solidus surface are reported. The deviation from stoichiometry is found to be up to ((0.6-13.8) \times 10^{-3}) at. (%) at temperatures from 945 to (1360 \mathrm{~K}) and vapor pressures from 2.3 to (87.2 \mathrm{kPa}) on the tellurium side, while that on the cadmium side is ((0.1-3.3) \times 10^{-3}) at.% in the temperature and vapor pressure ranges from 695 to (992 \mathrm{~K}) and from 0.5 to (57.3 \mathrm{kPa}), respectively. The position of the congruent sublimation curve in the (P-T-X) phase space is discussed and some specifics of the solidus surface are outlined. The maximum congruent sublimation temperature was found to be (1324 \mathrm{~K}, 41 \mathrm{~K}) lower than the maximum melting point of CdTe. (P(\mathrm{Cd})-T) and (P\left(\mathrm{Te}_{2}\right)-T) projections of the (\mathrm{Cd}-\mathrm{Te}) phase diagram are presented. Partial molar enthalpies and entropies of the component elements are deduced for cadmium telluride. O 1993 Academic Press. Inc.