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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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

Xu, Xiaoxiang and Tao, Shanwen and Wormald, Philip and Irvine, John T. S. (2010) Intermediate temperature stable proton conductors based upon SnP2O7, including additional H3PO4. Journal of Materials Chemistry, 20 (36). pp. 7827-7833. ISSN 0959-9428

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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 31 P 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 x 10(-2) S/cm at 300 degrees 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.