First principles calculations of the thermoelectric properties of α-MnO2 and β-MnO2 Mirriam Chepkoech, Daniel P. Joubert and George O. Amolo Eur. Phys. J. B, 91 12 (2018) 301 Published online: 03 December 2018 DOI: 10.1140/epjb/e2018-90321-4