期刊
NATURE NANOTECHNOLOGY
卷 8, 期 6, 页码 445-451出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2013.95
关键词
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资金
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- US Department of Energy, Office of Basic Energy Sciences, through the S3TEC Energy Frontier Research Center [DESC0001299]
- Joint Directed Research and Development programme of the UTK Science Alliance
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
Materials with very low thermal conductivity are of great interest for both thermoelectric and optical phase-change applications. Synthetic nanostructuring is most promising for suppressing thermal conductivity through phonon scattering, but challenges remain in producing bulk samples. In crystalline AgSbTe2 we show that a spontaneously forming nanostructure leads to a suppression of thermal conductivity to a glass-like level. Our mapping of the phonon mean free paths provides a novel bottom-up microscopic account of thermal conductivity and also reveals intrinsic anisotropies associated with the nanostructure. Ground-state degeneracy in AgSbTe2 leads to the natural formation of nanoscale domains with different orderings on the cation sublattice, and correlated atomic displacements, which efficiently scatter phonons. This mechanism is general and suggests a new avenue for the nanoscale engineering of materials to achieve low thermal conductivities for efficient thermoelectric converters and phase-change memory devices.
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