Ferroelectric P4mm to relaxor P4bm transition and temperature-insensitive large strains in Bi(Mg0.5Ti0.5)O3-modified tetragonal 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 lead-free ferroelectric ceramics. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Li, Ling; Zhu, Mankang; Wei, Qiumei; Zheng, Mupeng; Hou, Yudong; Hao, Jigong
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 4(2018)
• Page Start: 1381
• Page End: 1388
• Publication Date: 2018-04
• Subjects: Bi0.5Na0.5TiO3 -- Tetragonal structure -- Ferroelectrics -- Bi(Mg0.5Ti0.5)O3 -- Field-induced strain; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.12.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Tetragonal phase (1–x)(0.875Bi0.5 Na0.5 TiO3 –0.125BaTiO3 )–xBi(Mg0.5 Ti0.5 )O3 lead-free ferroelectrics were designed and fabricated by a conventional solid state route. All the specimens exhibit a tetragonal perovskite structure, and undergo a phase evolution from ferroelectric P4mm to antiferroelectric relaxor P4bm as the BMT addition increases. The critical composition x = 0.04 makes a bridge between the both tetragonal phases, and gives a large field-induced strain of 0.30% and an adequately-large electrostrictive coefficient Q 33 of 0.0254 m 4 /C 2 . To be highlighted, the field-induce strain of the composition x = 0.04 shows an almost constant value over the temperature range of 18–100 °C, illustrating a temperature-insensitive behavior, which could be attributed to the widened gap between T R–E and T F–R . The temperature-insensitive large strain of the tetragonal BNT–BT–BMT composition give a promising potential for application in precision position actuators.