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J. Korean Ceram. Soc. > Volume 52(4); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(4): 237.
doi: https://doi.org/10.4191/kcers.2015.52.4.237
The Study on the Phase Transition and Piezoelectric Properties of Bi0.5(Na0.78K0.22)0.5TiO3-LaMnO3 Lead-free Piezoelectric Ceramics
Ku Tak Lee, Jung Soo Park, Jeong Ho Cho, Young Hun Jeong, Jong Hoo Paik, Ji Sun Yun
Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology
ABSTRACT
$Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3$ (BNKT) lead-free piezoelectric ceramics modified by $LaMnO_3$ (LM) were fabricated by conventional solid-state method. The crystal structure and the morphology of the lead free ceramics were analyzed by XRD (X-ray diffraction) and FE-SEM (Field Emission Scanning Electron Microscopy). The LM modified BNKT ceramics have a phase transition from ferroelectric tetragonal to non-polar pseudo-cubic. Despite decreases in the remnant polarization ($P_r$) and coercive field ($E_c$) in the P-E hysteresis loops, the electric-field induced strain properties were significantly enhanced by the LM modification. The highest value of $S_{max}/E_{max}=412pm/V$ at an applied electric field of 5 kV/mm was found in BNKT-0.01LM ceramic.
Key words: BNKT, $LaMnO_3$, Phase transition, Actuator, $S_{max}/E_{max}$(normalized strain)
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