[5] The authors would like to thank Brigita Kmet for help in TEM sample preparation. Maja Makarovic is acknowledged for the preparation of the ceramics. The work was carried out within the research program “Electronic Ceramics, Nano, 2D and 3D Structures” P2-0105 and within the project “High Performance Piezoelectric Materials for Sensors and Actuators in High-Temperature Applications” J2-5483 (Slovenian Research Agency).
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