Determination of the superstructure of BF-BT-based lead-free piezoelectric ceramics
The dual improvement of piezoelectric coefficient (d33) and ferroelectric-paraelectric phase transition temperature (TC) of BF-BT-based lead-free piezoelectric ceramics can be achieved by introducing BKT with tetragonal phase. The study of X-ray and Raman spectroscopy showed that the phase evolution from R3c to P4mm. In particular, the ceramic with x=0.010 located in the MPB region exhibits excellent performances with d33=149 pC/N, kp=38 %, Pr=28.2 ¿C/cm2 and TC=615 °C. Meanwhile, the temperature dependence of dielectric permittivity (¿r-T) showed that the introduction of BKT helps to improve TC and an additional frequency dispersion dielectric peak (T1) appeared at low temperature. In situ Raman spectroscopy and in situ d33 testing indicate the BiFeO3-BaTiO3-0.010Bi0.5K0.5TiO3 has excellent thermal stability (Td=570 °C). The knowledge of the structure is important for understanding the macroscopic properties and that this is the basis for further improving the materials. Therefore, it is necessary to use the neutron powder diffraction (NPD) to further clarify the formation of the T1, the origin of the TC improvement and mechanism of d33 variation with temperature.
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PORRO AZPIAZU Jose Maria; CUI Yongbao; LIU Laijun; PETRENKO Viktor; RIO LOPEZ Natalia Ahiova; RODRIGUEZ VELAMAZAN Jose Alberto; VILLAR Aritz and ZHANG Qi. (2023). Determination of the superstructure of BF-BT-based lead-free piezoelectric ceramics. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-787
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