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http://dx.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  

Lee, Ku Tak (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Park, Jung Soo (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Cho, Jeong Ho (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Jeong, Young Hun (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Paik, Jong Hoo (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Yun, Ji Sun (Intelligent Electronic Component Team, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.52, no.4, 2015 , pp. 237-242 More about this Journal
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.
Keywords
BNKT; $LaMnO_3$; Phase transition; Actuator; $S_{max}/E_{max}$(normalized strain);
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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