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The composite structure of mixed τ-(Ag, Cu)xV2O5 bronzes—Evidence for T dependant guest-species ordering and mobility

Hermes, Wilfred and Dollé, Mickaël and Rozier, Patrick and Lidin, Sven The composite structure of mixed τ-(Ag, Cu)xV2O5 bronzes—Evidence for T dependant guest-species ordering and mobility. (2013) Journal of Solid State Chemistry, 199. 84-89. ISSN 0022-4596

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Official URL: https://doi.org/10.1016/j.jssc.2012.11.029

Abstract

The complex structural behavior of τ-[AgCu]∼0.92V4O10 has been elucidated by single crystal X-ray diffraction and thermal analysis. The τ-phase region is apparently composed of several distinct phases and this study identifies at least three: τ1rt, τ2rt and τlt. τ1rt and τ2rt have slightly different compositions and crystal habits. Both phases transform to τlt at low temperature. The room temperature modification τ1rt crystallizes in an incommensurately modulated structure with monoclinic symmetry C2(0β1/2) [equivalent to no 5.4, B2(01/2γ) in the Intnl. Tables for Crystallography, Volume C] and the cell parameters a=11.757(4)Å, b=3.6942(5)Å c=9.463(2)Å β=114.62(2)° and the q-vector (00.921/2), but it is more convenient to transform this to a setting with a non-standard centering X=(1/21/200; 001/21/2; 1/21/21/21/2;) and an axial q vector (00.920). The structure features a vanadate host lattice with Cu and Ag guests forming an incommensurate composite. The structural data indicates perfect Ag/Cu ordering. At low temperature this modification is replaced by a triclinic phase characterized by two independent q-vectors. The τ2rt phase is similar to the low temperature modification τlt but the satellite reflections are generally more diffuse.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Lund University (SWEDEN)
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Deposited On:02 Apr 2020 15:05

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