Abstract
A simple theoretical model is developed to study the properties of fullerites under varying conditions of pressure and temperature. The model is initially applied to study the compression behavior of C70 and C84 solids in the light of other relations as well as experimental data. The model performed in a better way as compared with the other relations. The results obtained are found to be encouraging. The model is therefore extended for the study of C70 and C84 solids under varying conditions of pressure and temperature. We have computed the pressure and temperature dependence of V/V0, the coefficient of volume thermal expansion and the bulk modulus. The results are compared with the available experimental data. There is a good agreement between theory and experiment, which supports the validity of the model developed for fullerites.