Grain size and structure distortion characterization of α-MgAgSb thermoelectric material by powder diffraction
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Date
2020-05-21
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
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. © 2020 Chinese Physical Society and IOP Publishing Ltd
Description
Keywords
Thermal conductivity, Thermoelectric materials, Nanostructures, Hot pressing, Neutron diffraction, X-ray diffraction
Citation
Li, X., Zhang, Z., He, L., Avdeev, M., Ren, Y., Zhao, H., & Wang, F. (2020). Grain size and structure distortion characterization of α-MgAgSb thermoelectric material by powder diffraction. Chinese Physics B, 29(10), 106101. doi:10.1088/1674-1056/aba09c