Intermediate temperature stable proton conductors based upon SnP 2O7, including additional H3PO4

Xiaoxiang Xu, Shanwen Tao, Philip Wormald, J. T S Irvine

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34 Citations (Scopus)


In order to examine the influence of phosphate impurities upon the conduction properties of SnP2O7, SnP2O 7-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. © 2010 The Royal Society of Chemistry.

Original languageEnglish
Pages (from-to)7827-7833
Number of pages7
JournalJournal of Materials Chemistry
Issue number36
Publication statusPublished - 28 Sep 2010


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