Isotropic Conduction Network and Defect Chemistry in Mg 3+ δ Sb 2 ‐Based Layered Zintl Compounds with High Thermoelectric Performance

Thermoelectric performance in the layered Zintl phase n-type Mg3+ δ (Sb,Bi)2 is reported. Insertion of the excess Mg into the compounds is crucial for realizing n-type carrier transport with multivalley and isotropic character. An excellent ZT of 1.51 ± 0.06 at 716 K is achieved in the sintered polycrystals at the composition of Mg3.2Sb1.5Bi0.49Te0.01. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note:…