Equation of State and Thermal Expansivity under the Effect of High Pressure and High Temperature
| العنوان: | Equation of State and Thermal Expansivity under the Effect of High Pressure and High Temperature |
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| المؤلفون: | S. P. Upadhyay, Manoj Kumar |
| المصدر: | physica status solidi (b). 184:113-120 |
| بيانات النشر: | Wiley, 1994. |
| سنة النشر: | 1994 |
| مصطلحات موضوعية: | Equation of state, Work (thermodynamics), Chemistry, Thermodynamics, Condensed Matter Physics, Thermal expansion, Electronic, Optical and Magnetic Materials, symbols.namesake, Thermal, Melting point, symbols, van der Waals force, Constant (mathematics), Quantum |
| الوصف: | A simple method is developed to investigate interatomic separations and thermal expansion coefficients at pressures ranging from the atomspheric one up to the structural transition pressure, and temperatures ranging from RT to the melting temperature. The calculations are performed using an ionic model based on Harrison's quantum mechanical form for the overlap repulsive energy which takes into account the interactions up to second neighbours. The van der Waals dipole-dipole and dipole-quadrupole interactions evaluated from more accurate methods are also included in the model. The results depend sensitively on temperature and pressure. The thermal expansion coefficient increases with temperature, while this increase becomes rather slow as pressure is increased. A strong decline of the thermal expansion coefficient with pressure at a constant temperature is also obtained. The results are compared with available experimental data, and good agreement supports the validity of the method developed in the present work. |
| تدمد: | 1521-3951 0370-1972 |
| DOI: | 10.1002/pssb.2221840107 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::35226c5f4e84efe46d81b42a3151b17c https://doi.org/10.1002/pssb.2221840107 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........35226c5f4e84efe46d81b42a3151b17c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15213951 03701972 |
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| DOI: | 10.1002/pssb.2221840107 |