화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.31, No.10, 562-568, October, 2021
Bi1/2Na1/2TiO3-BiAlO3 무연 압전 세라믹스의 유전 및 전기 기계적 변형 특성에 대한 SrTiO3 첨가 효과
Effects of SrTiO3-Modification on the Dielectric and Electromechanical Strain Properties of Lead-Free Bi1/2Na1/2TiO3-BiAlO3 Piezoceramics
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(Bi1/2Na1/2)TiO3 (BNT)-based ceramics are considered promising candidates for actuator application owing to their excellent electromechanical strain properties However, to obtain large strain properties, there remain several issues such as thermal stability and high operating fields. Therefore, this study investigates a reduction of operating field in (0.98-x)Bi1/2Na1/ 2TiO3-0.02 BiAlO3-xSrTiO3 (BNT-2BA-100xST, x = 0.20, 0.21, 0.22, 0.23, and 0.24) via analyses of the microstructure, crystal structure, dielectric, polarization, ferroelectric and electromechanical strain properties. The average grain size of BNT-2BA- 100xST ceramics decreases with increasing ST content. Results of polarization and electromechanical strain properties indicate that a ferroelectric to relaxor state transition is induced by ST modification. As a consequence, a large electromechanical strain of 592 pm/V is obtained at a relatively low electric field of 4 kV/mm in 22 mol% ST-modified BNT-2BA ceramics. We believe that the materials synthesized in this study are promising candidates for actuator applications.
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