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Issue 17, 2018
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Structural phase transitions in YPtGe2 and GdPtGe2

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Abstract

The germanides YPtGe2 and GdPtGe2 were synthesized from REGe2 precursor compounds and platinum by arc-melting and their structures were studied on the basis of temperature-dependent single crystal X-ray diffraction data. At room temperature both germanides adopt the orthorhombic YIrGe2 type structure, space group Immm, with enhanced U11 displacement parameters for the Ge1 atoms. Below 174 and 145 K, respectively, satellite reflections emerge in the diffraction patterns, giving rise to modulations. The low-temperature structures were refined in the superspace group Pnnn(1/2,1/2,γ)qq0 (48.1.11.3). The structural phase transition is also evident in the magnetic susceptibility, specific heat and resistivity data. The high- and low-temperature modifications are discussed on the basis of a group–subgroup scheme.

Graphical abstract: Structural phase transitions in YPtGe2 and GdPtGe2

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Publication details

The article was received on 02 Mar 2018, accepted on 08 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00815A
Citation: Dalton Trans., 2018,47, 6075-6088
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    Structural phase transitions in YPtGe2 and GdPtGe2

    O. Janka, R. Hoffmann, B. Heying and R. Pöttgen, Dalton Trans., 2018, 47, 6075
    DOI: 10.1039/C8DT00815A

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