| Autor: |
J. C. Austin, M. L. Swanson, Wm. C. Hughes |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Journal of Crystal Growth. 138:1040-1045 |
| ISSN: |
0022-0248 |
| Popis: |
We have measured the thermodynamic properties of In-V Hg pairs in the infrared material Hg 0.79 Cd 0.21 Te by using the method of perturbed angular correlation (PAC). PAC allows the determination of the absolute fraction of indium atoms in particular defects. Previous measurements have characterized the In-V pairs with hyperfine interaction frequencies of 83 and 92 MHz. These defects were observed in materials which were quenched from > 350dC to retain a large number of metal vacancies. After subsequent low temperature (60 l T A l 110dC) anneals, the fraction of indium atoms that had trapped vacancies increased because of the migration of metal vacancies. By measuring the rate of increase at different temperatures, we determined the vacancy migration energy to be E m = 0.45 p 0.04 eV. Anneals at slightly higher temperatures dissociated the In-V pairs. From the decrease in the In-V pair fraction with temperature, the In-V pair binding energy was found to be E b = 0.44 p 0.15 eV. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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