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J. Korean Ceram. Soc. > Volume 57(5); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(5): 570-577.
doi: https://doi.org/10.1007/s43207-020-00051-y
Effect of SrTiO3 modification on dielectric, phase transition and piezoelectric properties of lead‑free Bi0.5Na0.5TiO3‒CaTiO3‒SrTiO3 piezoelectric ceramics
Hoang Thien Khoi Nguyen1, Trang An Duong1, Farrukh Erkinov1, Hyungwon Kang2, Byeong Woo Kim3, Chang Won Ahn4, Hyoung‑Su Han1 , Jae‑Shin Lee1
1School of Materials Science and Engineering, University of Ulsan, Ulsan, Republic of Korea
2Electronic Convergence Materials and Device Research Center, Korea Electronic Technology Institute, Seongnam‑si, Republic of Korea
3Department of Electrical Engineering, University of Ulsan, Ulsan, Republic of Korea
4Department of Physics and EHSRC, University of Ulsan, Ulsan, Republic of Korea
Correspondence  Hyoung‑Su Han ,Email: hsejs@ulsan.ac.kr
Received: February 6, 2020; Revised: April 16, 2020   Accepted: April 17, 2020.  Published online: September 30, 2020.
ABSTRACT
This study investigated the structures, dielectric, ferroelectric and piezoeletric properties of lead-free (0.99‒x) Bi0.5Na0.5TiO3‒0.01CaTiO3xSrTiO3 (BNT‒CT‒100xST, x = 0.22–0.30) piezoelectric ceramics. These piezoceramics were successfully prepared using the conventional solid-state reaction method sintered at 1175 °C for 2 h. It was found that a phase transition from nonergodic relaxor to ergodic relaxor was induced by ST modification in BNT‒CT ceramics. Consequently, a large electromechanical strain of 0.20% corresponding to high normalized strain d 33 of 667 pm/V was obtained even under 3 kV/mm for BNT‒CT‒28ST ceramics. Therefore, it is noted that lead-free BNT‒CT‒100xST ceramics can be promising candidates for actuator applications.
Key words: Piezoelectric properties · Dielectric properties · Lead-free · Relaxor · Ternary system
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