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Issue 23, 2013
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Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

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Abstract

We present a comprehensive study of the solid solution system Ca2(MoO4)2–NaGd(MoO4)2 on the molecular scale, by means of site-selective time resolved laser fluorescence spectroscopy (TRLFS). Eu3+ is used as a trace fluorescent probe, homogeneously substituting for Gd3+ in the solid solution crystal structure. Site-selective TRLFS of a series of polycrystalline samples covering the whole composition range of the solid solution series from 10% substitution of Ca2+ to the NaGd end-member reveals it to be homogeneous throughout the whole range. The trivalent ions are incorporated into the powellite structure in only one coordination environment, which exhibits a very strong ligand–metal interaction. Polarization-dependent measurements of a single crystal of NaGd(Eu)(MoO4)2 identify the coordination geometry to be of C2v point symmetry. The S4 symmetry of the Ca site within the powellite lattice can be transformed into C2v assuming minor motion in the first coordination sphere.

Graphical abstract: Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

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Publication details

The article was received on 15 Jan 2013, accepted on 04 Apr 2013 and first published on 04 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT50146A
Citation: Dalton Trans., 2013,42, 8387-8393
  • Open access: Creative Commons BY license
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    Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

    M. Schmidt, S. Heck, D. Bosbach, S. Ganschow, C. Walther and T. Stumpf, Dalton Trans., 2013, 42, 8387
    DOI: 10.1039/C3DT50146A

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