Polarization and strain behaviors of 0.74BiNaTiO3–0.26SrTiO3/Bi0.5(Na0.8K0.2)0.5TiO3 ceramic composite |
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| Affiliation: | 1. Battery Research Center, Korea Electrotechnology Research Institute, Changwon, Republic of Korea;2. Department of Electrical Functionality Material Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea;1. School of Advanced Materials Engineering, Changwon National University, Gyeongnam 641-773, Republic of Korea;2. Department of Physics, Changwon National University, Gyeongnam 641-773, Republic of Korea;3. Department of Advanced Materials Science & Engineering, Sun-Moon University, Chungnam 336-708, Republic of Korea;1. Battery Research Center, Korea Electrotechnology Research Institute, 28-1 Sungju-Dong, Changwon 641-120, Republic of Korea;2. Department of Electrical Functionality Material Engineering, University of Science and Technology, Daejeon 305-333, Republic of Korea;1. School of Materials Science and Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, Republic of Korea;2. Department of Physics, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, Republic of Korea;1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209 China;2. Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu, 610209 China;1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710119, PR China;2. School of Science, Xi’an University of Posts and Telecommunications, Xi’an, 710121, PR China;3. Department of Electrical Engineering, National Cheng Kung University, Tainan City, 701, Taiwan |
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| Abstract: | We investigated the temperature- and frequency-dependent polarization and strain of two bismuth-based perovskite materials, a matrix material and a seed material, with which we formed a composite whose properties we likewise investigated. The chosen matrix material is 0.74Bi0.5Na0.5TiO3–0.26SrTiO3 (BNT-ST) which has a transition point of ~65 °C, from the relaxor to the ferroelectric phase (TR-F). The seed material was Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT), which possesses a TR-F of 120 °C. Different polarization and strain behaviors were observed in the BNT-ST/BNKT composite at different test temperatures. At T=25 °C (<TR-F of the relaxor BNT-ST), the composite exhibited a hysteretic polarization loop and parabolic strain curves which involve an ergodic relaxor-to-normal ferroelectric phase transition with application of an external electric field and the reverse ferroelectric-to relaxor phase transition with removal of the field. When T=80 and 100 °C (>TR-F °f the relaxor BNT-ST and <TR-F of the ferroelectric BNKT), the BNT-ST/BNKT has a slim polarization loop and strain magnitudes that are slightly increased from those of pure BNT-ST. When T=120 °C (~TR-F of the ferroelectric BNKT), the composite has a very slim polarization loop and strain behavior with values that are almost same as those of pure BNT-ST. In addition, the P-S relation for the BNT-ST/BNKT is identical to that of BNT-ST as the operating frequency increases up to 100 Hz. This may be because the polarization of BNT-ST is lower than that of BNKT. The electric field-induced polarization and strain of the BNT-ST/BNKT composite with respect to the temperature and frequency are related to the thermal stability of the ferroelectric seed and the degree of the phase transition in the relaxor matrix. |
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| Keywords: | Lead-free piezoelectrics Ceramic composite Temperature-dependent polarization and strain |
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