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Issue 21, 2018
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Transverse vibration driven large uniaxial negative and zero thermal expansion in boron bridged REPt3B framework materials

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Abstract

In this work anomalous uniaxial thermal expansion behaviour at low temperatures along the c-direction of the tetragonal phase of different members of the antiperovskite REPt3B (RE = Sm, Gd–Tm) compounds is reported. Negative or zero thermal expansion (NTE/ZTE) behaviour in these compounds arises due to the transverse vibration of boron atoms in the linear Pt–B–Pt linkage. The coefficient of thermal expansion along the c-axis tends to become more negative in annealed compounds in comparison to those estimated for as-cast samples. While the as-cast TmPt3B and HoPt3B exhibit essentially ZTE behaviour, the NTE coefficient of annealed GdPt3B (∼−28 ppm K−1) is found to be even larger than that of the well known framework material ZrW2O8 (∼−9 ppm K−1) reported in the literature.

Graphical abstract: Transverse vibration driven large uniaxial negative and zero thermal expansion in boron bridged REPt3B framework materials

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Publication details

The article was received on 08 Feb 2018, accepted on 25 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP00934A
Citation: Phys. Chem. Chem. Phys., 2018,20, 14876-14883

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    Transverse vibration driven large uniaxial negative and zero thermal expansion in boron bridged REPt3B framework materials

    S. Mondal, C. Mazumdar and R. Ranganathan, Phys. Chem. Chem. Phys., 2018, 20, 14876
    DOI: 10.1039/C8CP00934A

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