(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.

Abstract
1.서 론
2. 실험 방법
3. 결과 및 고찰
4.결 론
References

• 이상섭(울산대학교 첨단소재공학부) | Sang Sub Lee (School of Material Science and Engineering, University of Ulsan)
• 이창헌(울산대학교 첨단소재공학부) | Chang-Heon Lee (School of Material Science and Engineering, University of Ulsan)
• 즈엉 짱 안(울산대학교 첨단소재공학부) | Trang An Duong (School of Material Science and Engineering, University of Ulsan)
• 김동혁(울산대학교 첨단소재공학부) | Dong Hyeok Kim (School of Material Science and Engineering, University of Ulsan)
• 김병우(울산대학교 전기공학부) | Byeong Woo Kim (Department of Electrical Engineering, University of Ulsan)
• 한형수(울산대학교 첨단소재공학부) | Hyoung-Su Han (School of Material Science and Engineering, University of Ulsan)
• 이재신(울산대학교 첨단소재공학부) | Jae-Shin Lee (School of Material Science and Engineering, University of Ulsan) Corresponding author