TY - JOUR ID - 1677 TI - Theoretical study of ThO2 by first principles calculations JO - Iranian Journal of Physics Research JA - IJPR LA - en SN - 1682-6957 AU - Mahdavi, M AU - Sahafi, M H AD - Department of Physics, Faculty of Science, University of Mazandaran, Babolsar, Iran Y1 - 2021 PY - 2021 VL - 21 IS - 1 SP - 91 EP - 109 KW - nuclear fuel KW - Debye-Einstein thermal model KW - vibrational entropy KW - volumetric expansion ā€ˇcoefficient DO - 10.47176/ijpr.21.1.41038 N2 - In this paper, the thermodynamic, structural properties and vibrational spectrum of thorium dioxide have been studied using the Density Functional Perturbation Theory (DFPT) and Density Functional Theory (DFT) in the framework of first principles calculations. Quantum espresso software, which is an open source computing code, has been used in order to compute the kohn-Sham equations to obtain the minimum total energy of crystal. The vibrational spectrum of the thorium dioxide was examined along various symmetrical directions, and the results showed the dynamical stability of the crystal system. The quasi-harmonic Debye-Einstein model as implemented in GIBBS2 Code was used to calculate the thermodynamic properties of thorium dioxide at high temperatures and pressures. The simulation results showed that the Debye temperature of thorium dioxide decreased with increasing temperature at a constant pressure and increased with increasing pressure at a constant temperature. Increasing the Debye temperature indicated an increase in the crystal stiffness and the average sound velocity. It was observed that the volumetric thermal expansion coefficient and gruneisen parameter decreased exponentially with increasing pressure at a constant temperature, while increased with increasing temperature at a constant pressure, indicating an increase in heat transfer in the crystal lattice UR - https://ijpr.iut.ac.ir/article_1677.html L1 - https://ijpr.iut.ac.ir/article_1677_e7e59b65a2ab3d1449ebdfdde7301b80.pdf ER -