Cation vacancies in ferroelectric PbTiO3 and Pb(Zr,Ti)O-3: A positron annihilation lifetime spectroscopy study

D. J. Keeble, S. Singh, R. A. Mackie, M. Morozov, S. McGuire, D. Damjanovic

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    34 Citations (Scopus)

    Abstract

    Positron annihilation lifetime spectroscopy measurements identify A- and B-site cation vacancies in ferroelectric perovskite oxides (ABO(3)). Crystal PbTiO3 and ceramic lead zirconium titanate (PZT) were studied and gave consistent values for the lifetime resulting from positron localization at lead vacancies V-Pb. Positron trapping to B-site vacancies was inferred in PZT. Temperature dependent studies showed that the defect specific trapping rate was higher for V-B compared to V-Pb, consistent with the larger negative charge. Doping PZT with Fe increased the fraction positron trapping to V-B compared to V-Pb-type defects.

    Original languageEnglish
    Article number144109
    Pages (from-to)-
    Number of pages5
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume76
    Issue number14
    DOIs
    Publication statusPublished - 2007

    Keywords

    • Positron
    • Positron annihilation
    • Ferroelectrics

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