Study of Phase Diagrams of Ternary Semiconductors.
Final rept. 20 Apr 80-19 Jul 83,
HUGHES RESEARCH LABS MALIBU CA
Pagination or Media Count:
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.
- Physical Chemistry
- Solid State Physics