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NMR relaxation times and proton motion in HxWO3

  • Solid-State Ionics
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Abstract

The relaxation timesT 1,T 1q,T 1D, andT 2 for1H in the tetragonal-A phase of HxWO3 have been measured over the temperature range 190 to 490 K. The1H relaxation behaviour appears to be governed by diffusion over inequivalent jump distances, approximating to a short range planar diffusion and a long range isotropic diffusion. Parameters for the latter motion are estimated asE a = 68 kJ/mol andτ 0=2.5×10−13 s. The powder X-ray diffraction pattern for this phase of HxWO3 has been studied over the temperature range 300–470 K. The tetragonal distortion diminishes with temperature and H0.43 WO3 becomes cubic at about 435 K. Volumetric studies of hydrogen evolution show that decomposition accelerates at approximately this temperature.

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Authors and Affiliations

  1. Inorganic Chemistry Laboratory, South Parks Road, OX1 3QR, Oxford, UK

    D. A. Claridge & P. G. Dickens

  2. Centre for Materials Science and Engineering, University of Texas at Austin, TX 78712, Austin, Texas, USA

    J. B. Goodenough

Authors
  1. D. A. Claridge
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  2. P. G. Dickens
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  3. J. B. Goodenough
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Claridge, D.A., Dickens, P.G. & Goodenough, J.B. NMR relaxation times and proton motion in HxWO3 . Appl. Phys. A 49, 65–68 (1989). https://doi.org/10.1007/BF00615466

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  • DOI: https://doi.org/10.1007/BF00615466

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