Debye temperature and standard entropies and enthalpies of compound semiconductors of the type I-III-VI2
| Autor: | F. A. Thiel, K. J. Bachmann, F. S. L. Hsu, H. M. Kasper |
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| Rok vydání: | 1977 |
| Předmět: |
Solid-state physics
Chemistry Enthalpy Thermodynamics Atmospheric temperature range Condensed Matter Physics Heat capacity Electronic Optical and Magnetic Materials symbols.namesake Constant pressure Materials Chemistry symbols Compound semiconductor Electrical and Electronic Engineering Debye model Debye |
| Zdroj: | Journal of Electronic Materials. 6:431-448 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/bf02660497 |
| Popis: | The heat capacities at constant pressure have been measured for CuInSe2, CuInTe2 and AgGaTe2 in the temperature range 1K ≤T≤40K and for CuInS2 and AgInTe2 between 1 K and room temperature. From the low temperature data we derive the following Debye temperatures θD in the limit T → O K: θD(CuInS2) = 273 K, θD(CuInSe2) = 222 K, θD(CuInTe2) = 191 K, θD(AgGaTe2) = 182 K and θD(AgInTe2) = 156 K. A plot of the average atomic heat capacity at constant volume Cv shows that the data scale to one general curve for all 5 compounds considered in this paper. This is, also, true for a plot Cv, i.e., all I-III-VI2 compounds measured thus far deviate similarly from the Debye approximation. By integration of the general curves Cv(T/θD) and θD x Cv(T/θD) we derive tne standard entropies S 0 298 and energies E 0 298 -E 0 0 of 11 compounds of the type I-III-VI2, for which the Debye temperatures are known. The difference between the energies E 0 298 -E 0 0 and enthalpies H 0 298 -H 0 0 is within the error limits of the experimental data (< 1%). The molar S 0 298 and H 0 298 -H 0 0 values for the I-III-VI2 compounds are approximately twice the corresponding molar values for their II-VI isoelectronic analogs. The thermodynamic functions at standard state obtained by integration of the experimental data are all < 10% smaller than the corresponding values estimated on the basis of the Debye approximation. |
| Databáze: | OpenAIRE |
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