Some Properties of In[sub 2]Te[sub 3] and Ga[sub 2]Te[sub 3]

Abstract

This paper summarizes the measurements which have been made to determine various physical parameters for the compounds and . The previously described problems of the preparation of stoichiometric and and the associated question of ordering of lattice vacancies in are reviewed briefly. Measurements of the thermal coefficient of expansion of the two compounds at liquid air and room temperatures are described. The main section of the work concerns the measurements of electrical conductivity and Hall effect in the compounds. The determination of activation energy values from the electrical measurements and their relation to the energy gap is discussed, and values of activation energies and also of electron mobilities are given for ordered and disordered . It is shown that the change in activation energy in at 470°C is not associated with a change in structure, and an explanation in terms of change in conduction band minimum is considered. Results of preliminary room temperature measurements of thermal conductivity in and ordered are given.