Thermal properties of the orthorhombic CaSnO3 perovskite under pressure from ab initio quasi-harmonic calculations

Author(s)

Maul, J. ^{[1, 2, 3, 4]} ; Santos, I. M. G. ^[2] ; Sambrano, J. R. ^[1] ; Erba, A. ^{[3, 4]}

Affiliation

^[1] Sao Paulo State Univ, INCTMN UNESP, Grp Modelagem & Simulacao Mol, BR-17033360 Bauru, SP - Brazil

^[2] Univ Fed Paraiba, INCTMN UFPB, Lab Combustiveis & Mat, BR-58051900 Joao Pessoa, PB - Brazil

^[3] Univ Turin, Dipartimento Chim, Via Giuria 5, I-10125 Turin - Italy

^[4] Ctr Excellence, NIS, Nanostruct Interfaces & Surfaces, Via Giuria 5, I-10125 Turin - Italy

• Document type: Journal article
• Source: THEORETICAL CHEMISTRY ACCOUNTS; v. 135, n. 2 JAN 28 2016.
• Web of Science Citations: 8

Abstract

Structural, elastic and thermodynamic properties of the orthorhombic CaSnO3 perovskite are theoretically investigated at the ab initio level as a function of temperature and pressure. Harmonic and quasi-harmonic lattice dynamical calculations are performed with the Crystal program, by explicitly accounting for thermal expansion effects and by exploring the effect of several DFT functionals. The anisotropic, directional elastic response of the system is characterized up to 20 GPa of pressure. The thermal lattice expansion and elastic bulk modulus are described at simultaneous temperatures up to 2000 K and pressures up to 20 GPa. The Gibbs free energy of formation of CaSnO3 from CaO and SnO2 as a function of temperature is also addressed by means of fully converged phonon dispersion calculations on the three systems. (AU)

• FAPESP's process: 13/19289-0 - Redox reactions of gases by the catalyst TiO2 with Cerium-doped atoms: a computational study
• Grantee: Julio Ricardo Sambrano
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC