FROM METAL-HYDRIDES TO THE METAL HYDROGEN SYSTEM

Most conventional work on metal hydrides has been restricted to compositions and temperatures at which they are stable under normal pressure. In this paper we describe some results of our recent high-pressure experiments which have been performed in order to extend our scope to the entire range of metal-hydrogen systems. Thus, general features of phase diagrams of binary metal-hydrogen systems, encompassing the whole composition range and temperatures up to the melting point of constituent phases, are established, and a general compression behavior of hydrogen atoms in metallic environment, including interstitial hydrogen and elemental metallic hydrogen, is inferred.