Intrinsic low thermal conductivity in weakly ionic rocksalt structures
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and HiPSEC
- Auburn Univ., AL (United States). Physics Dept.
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computer Science and Mathematics Division
- Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science
A fundamental challenge in thermoelectric (TE) material research is meeting the simultaneous requirements of high carrier mobility and low thermal conductivity. Simple crystal structures are ideal for maintaining high carrier mobility, but they usually have high thermal conductivity. Here we show by first-principles lattice dynamics and Boltzmann transport calculations that weakly ionic rocksalt structures exhibit strong lattice anharmonicity and low acoustic-phonon group velocity, which combine to produce intrinsic low thermal conductivity. As a result, we unveil microscopic mechanisms that explain experimental observations and provide insights for TE material design and discovery.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Univ. of Nevada, Las Vegas, NV (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0001982; AC05-00OR22725
- OSTI ID:
- 1265604
- Alternate ID(s):
- OSTI ID: 1198663; OSTI ID: 1332444
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 9 works
Citation information provided by
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