Research on Improved II-VI Crystals.
Final technical rept. 1 Jun 68-31 May 70,
CLEVITE CORP CLEVELAND OHIO ELECTRONIC RESEARCH DIV
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Thermodynamic properties associated with the II-VI systems have been determined from various published data and from experimental work done here. Accurate vapor pressure equations have been obtained for Zn, Cd, S, Se, and Te. The phase diagrams of the Zn-S, Cd-S, Zn-Se, Cd-Se, Zn-Te, and Cd-Te systems have been established, although in some cases only tentatively. The temperature dependent equilibrium constants for the sublimation of ZnS, CdS, ZnSe, CdSe, ZnTe, and CdTe have been accurately evaluated. The component pressures at the solid stability field boundaries P-T diagrams of CdS, CdSe, ZnTe, and CdTe have been determined experimentally. The boundary pressures for ZnS and ZnSe are estimated by analogy. A theory of the constitution of the equilibrium liquid at the solid stability field boundaries invoking specific molecular species has been developed and applied to the Cd-Te system. The compositions at the solid stability field boundaries x-T diagrams of CdS and ZnTe have been tentatively evaluated. Some application of this basic information has been made in exercising control of II-VI crystal growth and treatment. Author
- Physical Chemistry
- Solid State Physics