The effects of alkaline-earth-metal-element doping on the thermoelectric properties of β-Zn4Sb3 Mian Liu, Changsong Liu and Xiaoying Qin Eur. Phys. J. Appl. Phys., 97 (2022) 21 Published online: 04 April 2022 DOI: 10.1051/epjap/2022210237