Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
Direct observation of one-dimensional disordered diffusion channel in a chain-like thermoelectric with ultralow thermal conductivity. / Zhang, Jiawei; Roth, Nikolaj; Tolborg, Kasper et al.
In: Nature Communications, Vol. 12, No. 1, 6709, 12.2021.Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - Direct observation of one-dimensional disordered diffusion channel in a chain-like thermoelectric with ultralow thermal conductivity
AU - Zhang, Jiawei
AU - Roth, Nikolaj
AU - Tolborg, Kasper
AU - Takahashi, Seiya
AU - Song, Lirong
AU - Bondesgaard, Martin
AU - Nishibori, Eiji
AU - Iversen, Bo Brummerstedt
N1 - © 2021. The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Structural disorder, highly effective in reducing thermal conductivity, is important in technological applications such as thermal barrier coatings and thermoelectrics. In particular, interstitial, disordered, diffusive atoms are common in complex crystal structures with ultralow thermal conductivity, but are rarely found in simple crystalline solids. Combining single-crystal synchrotron X-ray diffraction, the maximum entropy method, diffuse scattering, and theoretical calculations, here we report the direct observation of one-dimensional disordered In 1+ chains in a simple chain-like thermoelectric InTe, which contains a significant In 1+ vacancy along with interstitial indium sites. Intriguingly, the disordered In 1+ chains undergo a static-dynamic transition with increasing temperature to form a one-dimensional diffusion channel, which is attributed to a low In 1+-ion migration energy barrier along the c direction, a general feature in many other TlSe-type compounds. Our work provides a basis towards understanding ultralow thermal conductivity with weak temperature dependence in TlSe-type chain-like materials.
AB - Structural disorder, highly effective in reducing thermal conductivity, is important in technological applications such as thermal barrier coatings and thermoelectrics. In particular, interstitial, disordered, diffusive atoms are common in complex crystal structures with ultralow thermal conductivity, but are rarely found in simple crystalline solids. Combining single-crystal synchrotron X-ray diffraction, the maximum entropy method, diffuse scattering, and theoretical calculations, here we report the direct observation of one-dimensional disordered In 1+ chains in a simple chain-like thermoelectric InTe, which contains a significant In 1+ vacancy along with interstitial indium sites. Intriguingly, the disordered In 1+ chains undergo a static-dynamic transition with increasing temperature to form a one-dimensional diffusion channel, which is attributed to a low In 1+-ion migration energy barrier along the c direction, a general feature in many other TlSe-type compounds. Our work provides a basis towards understanding ultralow thermal conductivity with weak temperature dependence in TlSe-type chain-like materials.
KW - CRYSTALS
KW - MAXIMUM-ENTROPY-METHOD
KW - TRANSPORT
U2 - 10.1038/s41467-021-27007-y
DO - 10.1038/s41467-021-27007-y
M3 - Journal article
C2 - 34795243
VL - 12
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 6709
ER -