Temperature-Dependent Phase Transitions in the Lead-Free Piezoceramics (1 – x – y)(Bi1/2Na1/2)TiO3–xBaTiO3–y(K0.5Na0.5)NbO3 Observed by in situ Transmission Electron Microscopy and Dielectric Measurements

Jens Kling, Wook Jo, Robert Dittmer, Silke Schaab, Hans-Joachim Kleebe

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Lead-free piezoelectric (1 – x – y)(Bi1/2Na1/2)TiO3–xBaTiO3–y(K0.5Na0.5)NbO3 (BNT–BT–KNN) ceramics were examined in situ under increasing temperature in the transmission electron microscope. Changing superstructure reflections indicate a transition from rhombohedral to tetragonal to cubic phase with broad coexistence regions. The additional evolution of the microstructure in combination with dielectric measurements leads to a model of two relaxor-type phase evolutions with temperature.
    Original languageEnglish
    JournalJournal of the American Ceramic Society
    Volume96
    Issue number10
    Pages (from-to)3312-3324
    ISSN0002-7820
    DOIs
    Publication statusPublished - 2013

    Keywords

    • In situ processing
    • Measurements
    • Niobium oxide
    • Piezoelectric ceramics
    • Transmission electron microscopy
    • Sodium

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