Pressure dependence of structural and phonon properties of intermediate valence compound TmTe

The study on equation of states and pressure dependence of the phonon frequ encies of TmTe compound have been performed by using a simple interatomic p otential approach in the frame work of the rigid ion model. The compressibi lity study confirms that below 2 GPa valence of the Tm is (2+) while above 2 GPa there is a transition from Tm2+ to Tm3+. The phonon frequencies of Tm Te increases as pressure is increased. (C) 1999 Elsevier Science Ltd. All r ights reserved.