Ab initio study of phonon dispersion and thermodynamic properties of pure and doped pyrites Abolore A. Musari, Daniel P. Joubert, Joseph A. Olowofela, Adio T. Akinwale and Gboyega A. Adebayo Eur. Phys. J. B, 90 12 (2017) 254 Published online: 18 December 2017 DOI: 10.1140/epjb/e2017-80508-6