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Issue 28, 2017
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Structural irregularities and peculiarities of low-temperature thermal properties of Sn24P19.4Br8 clathrate

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Abstract

Temperature changes of the heat capacity and unit cell parameters of Sn24P19.4Br8 clathrate were experimentally determined in the temperature range of 2 to 300 K. The data obtained were analyzed using Debye–Einstein approximation and taking into account the impact of both disorder in the host matrix and the presence of vacancies in the framework. Anomalous negative contribution to the thermal expansion was revealed and related to the defect mode influence on the clathrate thermal properties as a result of vibrations of two-level systems (TLS). The guest atoms that have the opportunity to occupy spatially close yet energetically non-equivalent positions in the asymmetric environment of the host matrix atoms play a principal role in the TLS formation. The results are compared with those previously obtained for semiclathrate Ge31P15Se8.

Graphical abstract: Structural irregularities and peculiarities of low-temperature thermal properties of Sn24P19.4Br8 clathrate

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Publication details

The article was received on 03 Apr 2017, accepted on 12 Jun 2017 and first published on 30 Jun 2017


Article type: Paper
DOI: 10.1039/C7DT01196B
Citation: Dalton Trans., 2017,46, 9110-9117
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    Structural irregularities and peculiarities of low-temperature thermal properties of Sn24P19.4Br8 clathrate

    V. V. Novikov, A. V. Matovnikov, N. V. Mitroshenkov, B. I. Kornev, K. S. Pilipenko, M. S. Likhanov and A. V. Shevelkov, Dalton Trans., 2017, 46, 9110
    DOI: 10.1039/C7DT01196B

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