journal article·2020-04-13Open access

Lattice instabilities and phonon thermal transport in TlBr

Tribhuwan Pandey, Lucas Lindsay, Brian C. Sales, David S. Parker

Physical Review Materials· Volume 4· Issue 4

Abstract

This theoretical and experimental work finds the simple CsCl-structure TlBr to exhibit both high and extremely low thermal conductivity in different temperature ranges. First-principles calculations demonstrate that low room-temperature lattice thermal conductivity arises from avoided-crossing-related anharmonicity (only effective at appreciable temperatures) and multiple related lattice near instabilities. Evidence for `localized oscillator' thermal transport, originally hypothesized by Einstein, is also presented.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Advanced Thermoelectric Materials and Devices · Thermal Expansion and Ionic Conductivity

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