Ab Initio Thermal Conductivity Of Thermoelectric Mg3sb2: Evidence For Dominant Extrinsic Effects
PHYSICAL REVIEW B(2018)
摘要
The lattice thermal conductivity of the candidate thermoelectric material Mg(3)Sb(2 )is studied from first principles, with the inclusion of anharmonic, isotope, and boundary scattering processes, and via an accurate solution of the Boltzmann equation. We find that the anomalously low observed conductivity is due to grain-boundary scattering of phonons, whereas the purely anharmonic conductivity is an order of magnitude larger. Mass disorder due to alloying and off-stoichiometry is also found to contribute significantly to its decrease. Combining ab initio values vs sample size with measured grain-size distributions, we obtain an estimate of kappa vs T in nanopolycrystalline material in good agreement with typical experiments, and compute the ZT figure of merit in the various cases.
更多查看译文
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要