PARTIAL PRESSURES AND GIBBS FREE ENERGY OF FORMATION FOR CONGRUENTLY SUBLIMING CDTE(C),
Abstract
The partial pressures of Cd(g) and Te2(g) over congruently subliming CdTe(c) between 780 and 939C were determined by measuring the optical density of the coexisting vapor at 2287, 3650, 4357 and 5000 A. It is found that p(Cd) = 2P(Te2) and log p(Te2)(atm) = - (10000)/ T + 6.346. The standard Gibbs free energy of formation of Cd sub (1 - x) Te sub x(c) from Cd(g) and Te2(g) is delta G (CdTe(c)) = - 68.64 + 44.94 (0.001)T kcal/mole, independent of composition. This expression agrees quite well with those which represent the data obtained in electro-chemical and effusion experiments at lower temperatures, although the equilibrium state studied in the present investigation is different from the steady state attained in effusion experiments. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 17, 1964
- Accession Number
- AD0614292
Entities
People
- A. J. Strauss
- R. F. Brebrick
Organizations
- Massachusetts Institute of Technology