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Issue 20, 2012
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Characterisation of heterogeneous molybdate and chromate phase assemblages in model nuclear waste glasses by multinuclear magnetic resonance spectroscopy

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Abstract

A series of sodium borosilicate glasses containing cesium, molybdenum, and chromium was prepared to investigate the partitioning of chromium amongst the glass and phase-separated crystalline molybdates. The precipitates were examined by 133Cs, 23Na, and 95Mo MAS NMR, revealing a phase assemblage consisting of Na2MoO4, Na2MoO4·2H2O, Cs2MoO4, Cs2CrO4, CsNaMoO4·2H2O, and Cs3Na(MoO4)2. 133Cs MAS NMR indicates random substitution of Cr into the Mo sites of Cs3Na(MoO4)2 and provides a quantitative assessment of Cr incorporation. The sample compositions were verified by various analytical techniques and highlight the centrality of NMR in the identification and quantification of heterogeneous crystalline composites, including sensitivity to cationic substitution. The observation and facile interconversion of hydrated phases invites careful consideration of these materials for nuclear waste disposal.

Graphical abstract: Characterisation of heterogeneous molybdate and chromate phase assemblages in model nuclear waste glasses by multinuclear magnetic resonance spectroscopy

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Publication details

The article was received on 09 Mar 2012, accepted on 02 Apr 2012 and first published on 25 Apr 2012


Article type: Paper
DOI: 10.1039/C2CP40764G
Citation: Phys. Chem. Chem. Phys., 2012,14, 7375-7383
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    Characterisation of heterogeneous molybdate and chromate phase assemblages in model nuclear waste glasses by multinuclear magnetic resonance spectroscopy

    B. J. Greer and S. Kroeker, Phys. Chem. Chem. Phys., 2012, 14, 7375
    DOI: 10.1039/C2CP40764G

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