Investigation on structural, electronic, thermal and thermoelectric properties of ${\hbox {Al}}_{{{0.75}}}{\hbox {B}}_{{{0.25}}}\hbox {As}$ under pressure based on density functional theory

Abstract

In this paper, structural, electronic, thermal and thermoelectric properties of $\hbox {Al}_{\mathrm {0.75}}\hbox {B}_{\mathrm {0.25}}$As under 0, 2, 4 and 6 GPa pressure have been investigated based on density functional theory. Values of band gaps under 4 and 6 GPa pressure have been increased. The values of group velocity have been increased with increment in pressures from 0 GPa, too. The value of band gap at 0 GPa using the GGA(PBE) exchange-correlation potential and the mBJ method are close to each other. It is due to the good muffin-tin radius selection for atoms of the compound. Thermal properties have been investigated by calculating the heat capacity at constant volume (phonon and electronic contributions) and Debye temperature. Heat capacity at constant volume has been reduced and Debye temperature increased in comparison with AlAs. In Seebeck coefficient charge carriers are holes. Electrical conductivity in most of temperatures and electronic thermal conductivity in all the temperatures show increment with the increase in temperature and pressure.