Large electromechanical strain response in BiFeO3–BaTiO3-based ceramics at elevated temperature. (September 2021)

• Record Type: Journal Article
• Authors: Khan, Salman Ali; Ahmed, Tauseef; Habib, Muhammad; Akram, Fazli; Bae, Jihee; Song, Tae Kwon; Lim, Dong Hwan; Jeong, Soon-Jong; Kim, Myong-Ho; Lee, Soonil
• Is Part Of: Journal of physics and chemistry of solids. Volume 156(2021)
• Publication Date: 2021-09
• Subjects: Lead-free -- Electromechanical -- Ferroelectric -- Temperature dependence -- Piezoelectric; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110133
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: An approach of composition modification in (Bi, Na, Ba, Sr)(Ti, Nb, Zr)O3 (BNSTNZ)–modified 0.65Bi1.05 FeO3 –0.35BaTiO3 (BF35BT) piezoelectric materials was investigated. Introducing BNSTNZ into BF35BT ceramics led from the normal-ferroelectric to relaxor-ferroelectric- phase. At the optimum composition, large dynamic piezoelectric coefficient ( d 33 *) of 583 pm/V under the applied field of 5 kV/mm and relatively high static piezoelectric coefficient ( d 33 ) of 135 pC/N with high maximum temperature ( T m ≤ 400 °C) were obtained. The unipolar strain and d 33 * of BNSTNZ into BF35BT ceramics with x = 0.005 increased up to 0.251% and 718 pm/V at 90 °C. The remarkably enhanced field-induced strain response of BF35BT-based compositions is believed to be attributed to the optimum grain size, high tetragonality and the ferroelectric-relaxor phase coexistence. It is noted that this composition can be a favorable lead-free candidate for high-temperature piezoelectric applications. Highlights: Small amount of (Na, Sr) for A-site and (Nb, Zr) for B-site in BFBT induce large lattice distortion with high tetragonality. Large dynamic piezoelectric coefficient ( d 33 *) of 583 p.m./V under the applied field of 5 kV/mm at room temperature. The unipolar strain and d 33 * increased up to 0.251% and 718 p.m./V at 90 °C. Large piezoelectric response thanks to optimum grain size, high tetragonality, and ferroelectric-relaxor phase coexistence.