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Title: Intrinsic ultralow lattice thermal conductivity of the unfilled skutterudite FeSb 3

Journal Article · · Physical Review B
 [1];  [2];  [3];  [1]
  1. Jilin Univ., Changchun (China)
  2. Univ. of Missouri, Columbia, MO (United States)
  3. Shenzhen Univ., Shenzhen (China)

It is generally accepted that unfilled skutterudites process high lattice thermal conductivity $$κ_l$$ that can be efficiently reduced upon filling. Here by using first-principles Boltzmann-Peierls transport calculations, we find pure skutterudite of FeSb 3 with no filler in fact has an intrinsic ultralow $$κ_l$$ smaller than that of CoSb 3 by one order of magnitude. The value is even smaller than those of most of the fully filled skutterudites. This finding means that with FeSb 3 as a reference, filling does not necessarily lower $$κ_l$$. The ultralow $$κ_l$$ of FeSb 3 is a consequence of the overall softening of phonon spectrum, especially the lowering in frequency of optical phonon branches associated with the weakly bonded Sb 4 rings. They overlap more with heat-carrying acoustic phonons and significantly increase the phase space for three-phonon anharmonic scattering processes. This provides an alternative non-filling-related mechanism for lowering the $$κ_l$$ of skutterudites.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001299; FG02-09ER46577; SC0001299/DE-FG02-09ER46577
OSTI ID:
1388448
Alternate ID(s):
OSTI ID: 1290316
Journal Information:
Physical Review B, Vol. 94, Issue 7; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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