1. Experimental study of non-stoichiometry in Cd1−xZnxTe1±δ
- Author
-
Michael Fiederle, K.W. Benz, J.H. Greenberg, and V. N. Guskov
- Subjects
Chemistry ,Vapor pressure ,Thermodynamics ,Partial pressure ,Solidus ,Atmospheric temperature range ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Materials Chemistry ,Physical chemistry ,Electrical and Electronic Engineering ,Solubility ,Chemical composition ,Phase diagram ,Solid solution - Abstract
In this communication, the latest experimental results are presented on a composition of Cd1−xZnxTe1±δ, both x and δ, determined by the high-precision, vapor-pressure scanning method. The space arrangement of the single-phase solidus volume of Cd1−xZnxTe1±δ in the pressure-temperature-composition (P-T-X) phase space has been derived from direct vapor-pressure measurements in the temperature range up to 1,375 K. From the experimental data for x=0.0, 0.05, 0.1, 0.15, 0.25, 0.5, 0.75, 0.8, 0.9, and 1, the complete phase diagram of Cd1−xZnxTe1±δ was constructed. Transformation of the diagram was traced for the whole range of existence of the Cd1−xZnxTe1±δ solid solution as a function of ZnTe concentration. Increase of ZnTe in the solid solution results in the extension of the homogeneity range and a shift of the solidus toward Te, so that already for x≥0.15 the solidus does not contain the stoichiometric, (nCd+nZn):nTe=50 mol.% plane. From detailed experimental studies, maximum non-stoichiometry as a function of the temperature was determined in a wide temperature range for Te and metal solubility. Temperature dependencies of the partial pressures of vapor-phase species for different crystal compositions, XS=const, were deduced from the vapor-pressure experiment for the x=0.05 section of the diagram. From these results, relationships are derived between crystal composition, vapor pressure, and composition of the conjugated vapor.
- Published
- 2004