Accession Number : ADA133556

Title :   Study of Phase Diagrams of Ternary Semiconductors.

Descriptive Note : Final rept. 20 Apr 80-19 Jul 83,


Personal Author(s) : Kikuchi,R

PDF Url : ADA133556

Report Date : Aug 1983

Pagination or Media Count : 91

Abstract : In this three-year project on the theoretical studies of Hg-Cd-Te phase diagram, the liquidus and solidus have been calculated using the conditions to thermal coexistence of the liquid and solid. The pair approximation of the cluster variation method is used throughout, and the energy parameters are always treated as independent of temperature and composition. The lattice defects in the solid are neglected in the first treatment. By choosing energy parameters, it is possilbe to make the theroretical liquidus and solidus agree reasonably well with experiments. In the later formulation, lattice vacancies and antiatoms are taken into account. Then the theory shows that the temperature dependence of Hg vacancies is the same as that of holes in the valence band. The relation between the hole concentration and the partial pressure of Hg can also be derived with good agreement with experience.

Descriptors :   *Semiconductors, *Ternary compounds, *Phase diagrams, Mercury compounds, Cadmium tellurides, Liquid phases, Solid phases, Crystal lattices, Crystal defects

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE