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 |
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| Authors: | Jens Kling Wook Jo Robert Dittmer Silke Schaab Hans‐Joachim Kleebe |
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| Affiliation: | 1. Department of Materials Science, Technische Universit?t Darmstadt, , Darmstadt, 64287 Germany;2. Center for Electron Nanoscopy, Technical University of Denmark, , Kgs. Lyngby, 2800 Denmark |
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| 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. |
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