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Issue 36, 2010
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Intermediate temperature stable proton conductors based upon SnP2O7, including additional H3PO4

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Abstract

In order to examine the influence of phosphate impurities upon the conduction properties of SnP2O7, SnP2O7-H3PO4 composites were synthesised through different methods with varying starting P:Sn molar ratios. The composites were then carefully characterised by XRD, SEM, HRTEM, NMR, FT-IR and a.c. impedance spectroscopy to explore the phase compositions and electrical properties. It was found that cubic SnP2O7 is the main crystalline phase and amorphous phases were observed when starting P:Sn ratios exceeded 2 : 1. Solid State 31P NMR confirmed residual phosphoric acid in samples with high starting P:Sn ratios whilst impedance spectroscopy indicated these to be good proton conductors. The highest conductivity observed was 3.5 × 10−2 S/cm at 300 °C in air for samples with high starting P:Sn ratios and calcined at higher temperatures. The conductivity stability of the composites was found to be promising, suggesting a new approach for the development of technically useful proton conductors.

Graphical abstract: Intermediate temperature stable proton conductors based upon SnP2O7, including additional H3PO4

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Publication details

The article was received on 18 Apr 2010, accepted on 15 Jul 2010 and first published on 11 Aug 2010


Article type: Paper
DOI: 10.1039/C0JM01089H
Citation: J. Mater. Chem., 2010,20, 7827-7833
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    Intermediate temperature stable proton conductors based upon SnP2O7, including additional H3PO4

    X. Xu, S. Tao, P. Wormald and J. T. S. Irvine, J. Mater. Chem., 2010, 20, 7827
    DOI: 10.1039/C0JM01089H

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