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Ultralow thermal conductivity from transverse acoustic phonon suppression in distorted crystalline α-MgAgSb

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [7];  [8];  [2];  [2];  [9];  [10];  [11];  [2];  [12];  [13];  [14]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics; Songshan Lake Materials Laboratory, Dongguan (China); City Univ. of Hong Kong (Hong Kong). Dept. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences; DOE/OSTI
  2. Spallation Neutron Source Science Center, Dongguan (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  4. Songshan Lake Materials Laboratory, Dongguan (China)
  5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  6. Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia)
  7. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan). Inst. of Materials Structure Science
  8. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Japan Proton Accelerator Research Complex
  9. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics; Spallation Neutron Source Science Center, Dongguan (China)
  10. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  11. City Univ. of Hong Kong (Hong Kong). Dept. of Physics
  12. Univ. of Houston, TX (United States). Dept. of Physics. TcSUH
  13. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics
  14. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics; Songshan Lake Materials Laboratory, Dongguan (China); City Univ. of Hong Kong (Hong Kong). Dept. of Physics; City Univ. of Hong Kong (Hong Kong). Dept. of Physics
Low thermal conductivity is favorable for preserving the temperature gradient between the two ends of a thermoelectric material, in order to ensure continuous electron current generation. In high-performance thermoelectric materials, there are two main low thermal conductivity mechanisms: the phonon anharmonic in PbTe and SnSe, and phonon scattering resulting from the dynamic disorder in AgCrSe2 and CuCrSe2, which have been successfully revealed by inelastic neutron scattering. Using neutron scattering and ab initio calculations, we report here a mechanism of static local structure distortion combined with phononanharmonic-induced ultralow lattice thermal conductivity in α-MgAgSb. Since the transverse acoustic phonons are almost fully scattered by the compound’s intrinsic distorted rocksalt sublattice, the heat is mainly transported by the longitudinal acoustic phonons. The ultralow thermal conductivity in α-MgAgSb is attributed to its atomic dynamics being altered by the structure distortion, which presents a possible microscopic route to enhance the performance of similar thermoelectric materials.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1629018
Alternate ID(s):
OSTI ID: 1781000
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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