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

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dc.contributor.authorLi, XYen_AU
dc.contributor.authorLiu, PFen_AU
dc.contributor.authorZhao, EYen_AU
dc.contributor.authorZhang, ZGen_AU
dc.contributor.authorGuidi, Ten_AU
dc.contributor.authorLe, MDen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorIkeda, Ken_AU
dc.contributor.authorOtomo, Ten_AU
dc.contributor.authorKofu, Men_AU
dc.contributor.authorNakajima, Ken_AU
dc.contributor.authorChen, Jen_AU
dc.contributor.authorHe, LHen_AU
dc.contributor.authorRen, Yen_AU
dc.contributor.authorWang, XLen_AU
dc.contributor.authorWang, BTen_AU
dc.contributor.authorRen, ZFen_AU
dc.contributor.authorZhao, HZen_AU
dc.contributor.authorWang, FWen_AU
dc.date.accessioned2021-06-29T23:20:57Zen_AU
dc.date.available2021-06-29T23:20:57Zen_AU
dc.date.issued2020-02-18en_AU
dc.date.statistics2021-06-15en_AU
dc.description.abstractLow 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. © The Author(s) 2020.en_AU
dc.identifier.articlenumber942en_AU
dc.identifier.citationLi, X., Liu, P.-F., Zhao, E., Zhang, Z., Guidi, T., Duc Le, M., Avdeev, M., Ikeda, K., Otomo, T., Kofu, M., Nakajima, K., Chen, J., He, L., Ren, Y., Wang, X.-L., Wang, B.-T., Ren, Z., Zhao, H., & Wang, F. (2020). Ultralow thermal conductivity from transverse acoustic phonon suppression in distorted crystalline α-MgAgSb. Nature Communications, 11, 942, 1-9. doi:10.1038/s41467-020-14772-5en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.journaltitleNature Communicationsen_AU
dc.identifier.pagination1-9en_AU
dc.identifier.urihttps://doi.org/10.1038/s41467-020-14772-5en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10964en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectThermoelectric materialsen_AU
dc.subjectThermal conductivityen_AU
dc.subjectPhononsen_AU
dc.subjectAcousticsen_AU
dc.subjectScatteringen_AU
dc.subjectTemperature gradientsen_AU
dc.titleUltralow thermal conductivity from transverse acoustic phonon suppression in distorted crystalline α-MgAgSben_AU
dc.typeJournal Articleen_AU
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