Studies of protonic self-diffusion and conductivity in 12-tungstophosphoric acid hydrates by pulsed field gradient 1H NMR and ac conductivity

Temperature dependent protonic conductivities σ and 1H self-diffusion coefficients, D, are reported for polycrystalline hydrates of 12-tungstophosphoric acid (TPA). Conductivities were measured using ac admittance spectrometry and diffusion coefficients by the pulsed field gradient NMR technique. Co...

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Bibliographic Details
Published inSolid state ionics Vol. 28-30; pp. 594 - 600
Main Authors Slade, Robert C.T., Barker, Jeremy, Pressman, Helen A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.1988
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Summary:Temperature dependent protonic conductivities σ and 1H self-diffusion coefficients, D, are reported for polycrystalline hydrates of 12-tungstophosphoric acid (TPA). Conductivities were measured using ac admittance spectrometry and diffusion coefficients by the pulsed field gradient NMR technique. Conductivities for the hydrates TPA·nH2O (n=6, 14, 21) increase with n. Examination of σ and D values and of activation techniques shows self-diffusion and conduction to occur by different mechanisms in the higher hydrates.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(88)80108-5