Thermal expansion and heat capacity of gallium and indium arsenides

Thermal expansion of gallium and indium arsenides monocrystals within the temperature range of 396-1149 and 441-1206 K corresponding was studied for increasing the temperature range of the thermal coefficient in the direction of higher temperatures. The thermal expansion coefficients are determined and the Debye temperatures and mean square atoms displacements from the equilibrium position in the crystal lattice are calculated. The effect of the average atom mass value on the change of these parameters is noted. The obtained results on the isobar heat capacity for indium within the temperature range of 350-540 K supplement the most important thermophysical characteristics, which makes it possible to obtain the equation of the heat capacity temperature dependence from 200 K up to the melting temperatures