摘要
Nanostructuring, structure distortion, and/or disorder are the main manipulation techniques to reduce the lattice thermal conductivity and improve the figure of merit of thermoelectric materials. A single-phase α-MgAgSb sample, MgAg0.97Sb0.99, with high thermoelectric performance in near room temperature region was synthesized through a high-energy ball milling with a hot-pressing method. Here, we report the average grain size of 24–28 nm and the accurate structure distortion, which are characterized by high-resolution neutron diffraction and synchrotron x-ray diffraction with Rietveld refinement data analysis. Both the small grain size and the structure distortion have a contribution to the low lattice thermal conductivity in MgAg0.97Sb0.99.
作者
李西阳
张志刚
何伦华
Maxim Avdeev
任洋
赵怀周
王芳卫
Xiyang Li;Zhigang Zhang;Lunhua He;Maxim Avdeev;Yang Ren;Huaizhou Zhao;Fangwei Wang(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 101408,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Australian Nuclear Science and Technology Organisation,Lucas Heights,NSW 2234,Australia;X-ray Science Division,Argonne National Laboratory,Argonne,IL 60439,USA)
基金
Project supported by the National Natural Science Foundation of China(Grant No.11675255)
the National Key R&D Program of China(Grant No.2016YFA0401503).
