Ultra-low thermal conductivities along c-axis of naturally misfit layered Bi2[AE]2Co2Oy (AE = Ca, Ca0.5Sr0.5, Sr, Ba) single crystals

The intrinsically low thermal conductivity is fundamentally important for the development of high-performance thermoelectric and thermal insulating materials. Here, we observed ultra-low cross-plane thermal conductivities of naturally misfit layered single crystals Bi2[AE]2Co2Oy (AE = Ca, Ca0.5Sr0.5...

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Bibliographic Details
Published in:Applied physics letters 2017-07, Vol.111 (3)
Main Authors: Li, Lei, Yan, Xue-Jun, Dong, Song-Tao, Lv, Yang-Yang, Li, Xiao, Yao, Shu-Hua, Chen, Yan-Bin, Zhang, Shan-Tao, Zhou, Jian, Lu, Hong, Lu, Ming-Hui, Chen, Yan-Feng
Format: Article
Language:English
Subjects:
Applied physics
Barium
Calcium
Cryogenic effects
Cryogenic temperature
Lattice parameters
Single crystals
Strontium
Temperature dependence
Thermal conductivity
Thermal insulation
Thermoelectric materials
Time domain analysis
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Summary:The intrinsically low thermal conductivity is fundamentally important for the development of high-performance thermoelectric and thermal insulating materials. Here, we observed ultra-low cross-plane thermal conductivities of naturally misfit layered single crystals Bi2[AE]2Co2Oy (AE = Ca, Ca0.5Sr0.5, Sr, and Ba) using the time-domain thermoreflectance method. These low values are comparable to the lowest conductivity in crystalline oxides and approaching the theoretical conductivity minimum of disordered crystals. Besides, these samples show the amorphous-like temperature dependence at cryogenic temperatures and the effective mean free paths are in the same magnitudes as the lattice constants.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4995560