Structural and thermal properties of Eu2Ga11Sn35

Clathrates have been reported to form in a variety of different structure types; however, inorganic clathrate-I materials with a low-cation concentration have yet to be investigated. Furthermore, tin-based compositions have been much less investigated as compared to silicon or germanium analogs. We...

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Bibliographic Details
Published in:Journal of applied physics 2023-03, Vol.133 (9)
Main Authors: Gunatilleke, Wilarachchige D. C. B., Zhang, Mingjian, Wong-Ng, Winnie, Zavalij, Peter, Chen, Yu-Sheng, Nolas, George S.
Format: Article
Language:English
Subjects:
Applied physics
Cations
Clathrates
Composition
Germanium
Gruneisen parameter
Low temperature
Physics
Single crystals
Synchrotrons
Temperature dependence
Thermal conductivity
Thermodynamic properties
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Summary:Clathrates have been reported to form in a variety of different structure types; however, inorganic clathrate-I materials with a low-cation concentration have yet to be investigated. Furthermore, tin-based compositions have been much less investigated as compared to silicon or germanium analogs. We report the temperature-dependent structural and thermal properties of single-crystal Eu2Ga11Sn35 revealing the effect of structure and composition on the thermal properties of this low-cation clathrate-I material. Specifically, low-temperature heat capacity, thermal conductivity, and synchrotron single-crystal x-ray diffraction reveal a departure from Debye-like behavior, a glass-like phonon mean-free path for this crystalline material, and a relatively large Grüneisen parameter due to the dominance of low-frequency Einstein modes. Our analyses indicate thermal properties that are a direct result of the structure and composition of this clathrate-I material.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0119852