Suppressing the bipolar contribution to the thermoelectric properties of Mg2Si0.4Sn0.6 by Ge substitution

of Mg2Si0.4Sn0.6 by Ge substitution Libin Zhang, Penghao Xiao, Li Shi, Graeme Henkelman, John B. Goodenough, and Jianshi Zhou Materials Science and Engineering Program, University of Texas at Austin, Austin, Texas 78712, USA Department of Chemistry and the Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas 78712, USA Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA