Theoretical investigation on the effect of pressure on mechanical, thermo-physical and ultrasonic properties of La2CO3

La2CO3 is an intermetallic with hexagonal closed packed structure has been investigated for the transmission of acoustic wave in the 0 to 25 GPa operating pressure by using non-destructive testing method. For this, the Lennard-Jones interaction potential approach has been used to estimate the higher order elastic coefficients (SOECs and TOECs). The second and third order elastic properties for this material are computed using this model. Other elastic moduli, including bulk, Young's, and shear moduli as well as mechanical properties like hardness, melting temperature have been determined for La2CO3 with the aid of SOECs and Voigt-Reuss-Hill (VRH) approximations. Later, using SOECs and La2CO3 density in the same pressure range, three orientation dependent acoustic velocities that include Debye average velocities are investigated. Basic thermal characteristics such as specific heat at constant volume, thermal conductivity associated with lattice, thermal energy density, thermal relaxation time as well as acoustic coupling coefficients of La2CO3 intermetallic have been also calculated at same pressure range. The computation is also satisfactory in estimating the ultrasonic attenuation coefficients, arises due to the interaction of phonons, hardness as well as melting temperature under various pressures in this research work.