Mg₃Sb₂-based Zintl compounds have attracted extensive attention as potential thermoelectric materials due to their earth-abundant elements. However, pure and intrinsic p-type Mg₃Sb₂ manifests a poor thermoelectric performance because of its high electrical resistivity. It is reported that Ag doping in Mg sites can increase the mobility and carrier concentration of p-type Mg₃Sb₂; however, high thermal conductivity still limits the improvement of the ZT value. In the present work, Zn and Ag co-doping in Mg sites was carried out to optimize the thermoelectric performance of p-type Mg₃Sb₂. Experimental results revealed that the carrier concentration and mobility of Mg₃Ag_0.01Sb₂ significantly increased after Zn doping, leading to an improvement of the power factor. Simultaneously, lattice thermal conductivity was significantly reduced due to the large mass difference between Zn and Mg. The Mg_2.39Zn_0.6Ag_0.01Sb₂ sample with an optimal doping concentration of 3.95 × 10¹⁹ cm⁻³ achieved a maximum ZT value of 0.84 at 773 K. Hence, Zn and Ag co-doping is an effective method to improve the thermoelectric performance of p-type Mg₃Sb₂.

Mg ₃ Sb ₂基Zintl化合物由于其地球上丰富的元素而作为潜在的热电材料引起了广泛的关注。然而，纯本征p型Mg ₃ Sb ₂由于其高电阻率而表现出较差的热电性能。据报道，在Mg位点掺杂Ag可以提高p型Mg ₃ Sb ₂的迁移率和载流子浓度；然而，高热导率仍然限制了ZT值的提高。在目前的工作中，进行了 Mg 位的 Zn 和 Ag 共掺杂以优化 p 型 Mg ₃ Sb ₂的热电性能. 实验结果表明，掺杂Zn后Mg ₃ Ag _0.01 Sb ₂的载流子浓度和迁移率显着增加，导致功率因数提高。同时，由于 Zn 和 Mg 之间的质量差异很大，晶格热导率显着降低。最佳掺杂浓度为 3.95 × 10 ¹⁹  cm ^-3的 Mg _2.39 Zn _0.6 Ag _0.01 Sb ₂样品在 773 K 时达到了0.84的最大ZT值。因此，Zn 和 Ag 共掺杂是提高热电性能的有效方法p型Mg ₃ Sb _{2 的性能}.