| 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 |
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| ABSTRACT |
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$Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3$ (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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