Study the Effect of High Pressure and High Temperature on the Properties of Nacl-B1

Abstract

Equations of state are used for the evaluation of pressure effects on solid (Alkali halides) at room temperature and high temperature up to melting point, Thermodynamic properties such as V o , of alkali halide (NaCl-B1) at high pressure and room temperature have been evaluated and the results are compared with experimental data and gave good results up to 5 GPa but beyond it the results of these equations of state diverge from experimental data while Bardeen equation of state gave good agreement with experimental data , the effect of high pressure and high temperature on vibration energy of atoms ()and on heat capacity at constant volume () of (NaCl-B1) are calculated by using Debye Model and gave good agreement with the theory, also thermal volume and pressure (ℎ),(ℎ) and thermal expansion coefficient () are calculated by using thermal equation of state by Kumar. Finally, melting curve of (NaCl-B1) was calculated by using Kumar thermal equation of state with Lindeman equation the results were compared with experimental data. Also inter ionic distance at melting () for (NaCl-B1) was calculated by two ways, first by using lattce potential energy and second by using Anderson equation, and compared with data of other researcher and a good fitting was observed.