In recent years enormous effort has been put in understanding the chemical and physical properties of Cm and C70. Order-disorder transition in Cso occurs13; around 250 K at ambient pressure. At the transition freely rotating molecules get orientationally ordered in a simple cubic lattice. Application of pressure increases the transition temperature at a rate of Y 10 K kbar-', indicating that pressure favours the ordered state. The DSC and x-ray studies on C70 indicate two phase transitions, one around 270 K and the other around 34013; K at room pressure. These transitions also occur at higher temperatures at higher pressures. Application of pressure is found to lift the degeneracy of the energetically equivalent rotational configurations. The high pressure studies are reviewed in the light of existing literature
