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


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2020-02-18

AUTHORS

Xiyang Li, Peng-Fei Liu, Enyue Zhao, Zhigang Zhang, Tatiana Guidi, Manh Duc Le, Maxim Avdeev, Kazutaka Ikeda, Toshiya Otomo, Maiko Kofu, Kenji Nakajima, Jie Chen, Lunhua He, Yang Ren, Xun-Li Wang, Bao-Tian Wang, Zhifeng Ren, Huaizhou Zhao, Fangwei Wang

ABSTRACT

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 phonon-anharmonic-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. More... »

PAGES

942

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-020-14772-5

DOI

http://dx.doi.org/10.1038/s41467-020-14772-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1124936332

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/32071303


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17 schema:description 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 phonon-anharmonic-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.
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23 schema:keywords AgCrSe2
24 CuCrSe2
25 PbTe
26 SnSe
27 ab initio calculations
28 acoustic phonons
29 anharmonic
30 atomic dynamics
31 calculations
32 compounds
33 conductivity
34 conductivity mechanism
35 current generation
36 disorders
37 distortion
38 dynamic disorder
39 dynamics
40 end
41 generation
42 gradient
43 heat
44 high-performance thermoelectric materials
45 inelastic neutron scattering
46 initio calculations
47 lattice thermal conductivity
48 local structure distortion
49 longitudinal acoustic phonons
50 low thermal conductivity
51 materials
52 mechanism
53 microscopic route
54 neutron scattering
55 order
56 performance
57 phonon suppression
58 phonons
59 route
60 scattering
61 structure distortion
62 sublattice
63 suppression
64 temperature gradient
65 thermal conductivity
66 thermal conductivity mechanism
67 thermoelectric materials
68 transverse acoustic phonons
69 ultralow lattice thermal conductivity
70 ultralow thermal conductivity
71 α-MgAgSb
72 schema:name Ultralow thermal conductivity from transverse acoustic phonon suppression in distorted crystalline α-MgAgSb
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