State Key Laboratory of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China.
Inorg Chem. 2018 Oct 1;57(19):12125-12131. doi: 10.1021/acs.inorgchem.8b01704. Epub 2018 Sep 13.
This work shows that the thermoelectric properties of CrSe material are improved by doping with Ag. The influence of doping with Ag on the phase composition, microstructure, and thermoelectric properties of AgCrSe ( x = 0-0.02) compounds was thoroughly investigated. Ag atoms prefer to occupy the 6c Wyckoff position of the space group, accompanied expansion of the lattice and distortion of the octahedral structure units. The electrical conductivity increases at elevated temperature, while the lattice thermal conductivity decreases significantly through Ag doping, which is primarily attributed to the distorted structure and enhanced alloy scattering. Therefore, it produces a peak ZT value of 0.27 at 673 K for AgCrSe, which shows an increase of 23% compared with that of the undoped CrSe compound.
这项工作表明，通过掺杂 Ag 可以提高 CrSe 材料的热电性能。本文深入研究了 Ag 掺杂对 AgCrSe（x=0-0.02）化合物的相组成、微观结构和热电性能的影响。Ag 原子倾向于占据空间群的 6c Wyckoff 位置，伴随着晶格的膨胀和八面体结构单元的扭曲。随着温度的升高，电导率增加，而晶格热导率通过 Ag 掺杂显著降低，这主要归因于结构的扭曲和增强的合金散射。因此，AgCrSe 在 673 K 时产生了 0.27 的峰值 ZT 值，与未掺杂的 CrSe 化合物相比，增加了 23%。
