Application of high pressure-high temperature equation of state for elastic properties of solids

The theory of high pressure-high temperature equation of state recently developed is used to investigate the elastic properties of solids under the effect of temperature as well as pressure, The calculated values of temperature dependence of bulk modulus of NaCl are found to present a better agreement with the experimental data as compared with earlier relation, The results obtained for second-order elastic constants are found to present a good agreement with experimental data. It is concluded that the present approach is very simple and far better compared with the theory of lattice dynamics and two-body central potential. It makes the Situation very simple and straightforward as compared with earlier investigations. The results are reported for NaCl. KCl, CaF2, MgO, CaO, Mg2SiO4 and Al2O3. (C) 2002 Elsevier Science B.V. All rights reserved.