Dong, Jinfeng Sun, Fu-Hua Tang, Huaichao Hayashi, Kei Li, Hezhang Shang, Peng-Peng Miyazaki, Yuzuru Li, Jing-Feng Reducing Lattice Thermal Conductivity of MnTe by Se Alloying toward High Thermoelectric Performance Lead-free manganese telluride has been considered to be a promising candidate for mid-temperature thermoelectric materials. In this work, we report point defect scattering-induced reduction of thermal conductivity in MnTe with Se alloying, fabricated by a facile method combining mechanical alloying and spark plasma sintering. A low lattice thermal conductivity of 0.56 W/mK was obtained for MnTe<sub>0.92</sub>Se<sub>0.08</sub>, which is quite close to the amorphous limits. A detailed Debye model analysis reveals the underlying mechanism of phonon scattering and well predicts the thermal conductivity with different contents of Se. Meanwhile, a slight increase of carrier concentration was also observed after Se alloying, accompanied by a variation of energy gap that may be associated with the competition among anions in trapping charges. Further Na doping leads to enhanced electrical transport properties, achieving a maximum <i>ZT</i> value of 1.03 at 873 K. An average <i>ZT</i> of 0.52 and a calculated efficiency of more than 9% also suggest the promising application of MnTe at medium temperatures. conductivity;Se alloying;High Thermoelectric Performance Lead-free manganese telluride;report point defect scattering-induced reduction;MnTe 0.92 Se 0.08;ZT;Debye model analysis 2019-07-25
    https://acs.figshare.com/articles/journal_contribution/Reducing_Lattice_Thermal_Conductivity_of_MnTe_by_Se_Alloying_toward_High_Thermoelectric_Performance/9108299
10.1021/acsami.9b10207.s001