| Ferroelectric seeds-induced phase evolution and large electrostrain under reduced poling field in bismuth-based composites | |||||
| 작성자 | 김** | 작성일 | 2019-07-29 | 조회수 | 131 |
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Journal Article published Aug 2018 in Ceramics International volume 44 issue 11 on pages 13278 to 13285
Research funded by Ministry of Education (NRF-2017R1D1A1B03036032) | Basic Research Laboratory (NRF-2014R1A4A1071686)
AbstractBi0.5Na0.5TiO3-based piezoelectric ceramics have attracted great interest in actuator applications due to their high strain response; however, high driving field and large hysteresis of these materials are long-lasting obstacles for their commercial applications. Here, we use a strategy to overcome these hurdles by reducing poling field of the relaxor 0.96Bi0.5(Na0.78K0.22)0.5TiO3-0.04Bi(Mg0.5Ti0.5)O3 (BNKT-0.04BMT) matrix introducing ferroelectric (BNT, BKT and BNKT) seeds (10, 15 and 20?wt%). The poling field decreases with increasing ferroelectric seeds accompanied by the transformation from ergodic relaxor to ferroelectric phase. Consequently, large normalized strains (d*33 =?Smax/Emax = 560, 469 and 450?pm/V) were recorded for BNT (15?wt%), BKT (10?wt%) and BNKT (15?wt%) seeded composites under a reduced driving field of 2.5?kV/mm. These findings indicate that ferroelectric seeds are more effective in reducing the field for strain activation which can be appropriate for actuator devices. |
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