Tsdc and Neutron-Scattering Measurements on Ba1-Xlaxf2+X and Ba1-Xuxf2+2x Solid-Solutions

M Ouwerkerk, F. F. Veldkamp, Niels Hessel Andersen, J Schoonman

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    A study was made of the dynamical behaviour of bound interstitial fluoride ions in disordered Ba1−xLaxF2+x and Ba1−xUxF2+2x solid solutions with Thermally Stimulated Depolarisation Current measurements and neutron scattering measurements, and a combination of both techniques. From 10 K to 400 K the TSDC spectra showed four reorientation peaks to be present in Ba1−xLaxF2+x, and six in Ba1−xUxF2+2x, along with the relaxation of the macroscopic space charge. The position of a space charge peak shifted to lower temperatures with increasing solute content. The dipolar realaxations were concentration invariant. In Ba1−xLaxF2+x neutral associates, L-shaped- and (222)- clusters occur. The present study reveals (212)-clusters to be present in Ba1−xUxF2+2x. The relations between ion dynamics and defect structures are discussed.
    Original languageEnglish
    JournalSolid State Ionics
    Issue number1-4
    Pages (from-to)125-130
    Publication statusPublished - 1985


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