Grain size and structure distortion characterization of α-MgAgSb thermoelectric material by powder diffraction

Li, Xiyang; Zhang, Zhigang; He, Lunhua; Avdeev, Maxim; Ren, Yang; Zhao, Huaizhou; Wang, Fangwei

doi:10.1088/1674-1056/aba09c

Grain size and structure distortion characterization of α-MgAgSb thermoelectric material by powder diffraction

Journal Article · Fri Oct 09 00:00:00 EDT 2020 · Chinese Physics. B

DOI:https://doi.org/10.1088/1674-1056/aba09c· OSTI ID:1780987

Li, Xiyang ^[1]; Zhang, Zhigang ^[2]; He, Lunhua ^[2]; Avdeev, Maxim ^[3]; Ren, Yang ^[4]; Zhao, Huaizhou ^[5]; Wang, Fangwei ^[6]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Univ. of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Lab., Dongguan (China)
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW (Australia)
Argonne National Lab. (ANL), Argonne, IL (United States)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Dongguan (China)

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, MgAg_0.97Sb_0.99, with high thermoelectric performance in near room temperature region was synthesized through a high-energy ball milling with a hot-pressing method. In this work, 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 MgAg_0.97Sb_0.99.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1780987

Journal Information:: Chinese Physics. B, Journal Name: Chinese Physics. B Journal Issue: 10 Vol. 29; ISSN 1674-1056

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
diffraction
grain size
structure distortion
thermoelectric material

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