Monoclinic distortion, polarization rotation and piezoelectricity in the ferroelectric Na_0.5Bi_0.5TiO₃

Abstract

Time-resolved high-resolution X-ray diffraction has been implemented to investigate how monoclinic distortion in the ferroelectric Na0.5Bi0.5TiO3 responds to an external electric field. The results strongly favour the model of electric-field-induced polarization rotation and predict that even a sub-coercive electric field can change the direction of the spontaneous polarization vector by 30° or more.

Shock‐driven depolarization behaviors and electrical output in BiAlO3‐doped Bi0.5Na0.5TiO3 ferroelectric ceramics

“…28,29 The large polarization rotation induced by the phase transition was demonstrated to be the reason for the strong electromechanical coupling. 30 Recently, BNT ferroelectric ceramics showed a large current output associated with a high power output under shock compression, which was attributed to the polar-nonpolar phase transition from rhombohedral (ferroelectric) to orthorhombic (paraelectric) structure. 3 The power output values for BNT ceramics are higher than those of most ferroelectrics and allow various practical applications.…”

“…The competition between electrical and mechanical fields leads to different phase fractions in both PZT and BNT‐based materials 28,29 . The large polarization rotation induced by the phase transition was demonstrated to be the reason for the strong electromechanical coupling 30 . Recently, BNT ferroelectric ceramics showed a large current output associated with a high power output under shock compression, which was attributed to the polar–nonpolar phase transition from rhombohedral (ferroelectric) to orthorhombic (paraelectric) structure 3 .…”

New method to measure domain-wall motion contribution to piezoelectricity: the case of PbZr0.65Ti0.35O3 ferroelectric

“…In particular, this figure indicates that the angular separation between the sub-peaks ranges between 0.02 and 0.2 and such angular resolution of the experiments (0.01 ) must thus be ensured. Such high-resolution experiments were previously realized by Datta et al (2009), Gorfman & Thomas (2010), Gorfman et al (2011), and Choe et al (2018). The separation of the Bragg peaks along the 2 (or equivalent) axis led to the determination of the symmetry of individual ferroelastic domains.…”

“…To date, mostly powder diffraction has been applied in investigating ferroelectric materials in situ (Jones et al, 2006;Pramanick et al, 2011;Hinterstein et al, 2011;Esteves et al, 2015Esteves et al, , 2017Gorfman et al, 2016). The aim of the present work is to advance single-crystal X-ray crystallographic methods (Oddershede et al, 2015;Vergentev et al, 2016;Choe et al, 2018) and to measure the 'intrinsic' and 'extrinsic' contributions to the piezoelectric response in PbZr 0.65 Ti 0.35 O 3 (PZT35) by highresolution single-crystal X-ray diffraction under an external electric field. Compared with all the previously published reports, we have here increased the quality of both the experimental data and the data analysis technique.…”

Dielectric behaviors and relaxor characteristics in Bi0.5Na0.5TiO3-BaTiO3 ceramics

“…[1][2][3][4][5][6][7][8][9][10][11][12] BNT has a distorted perovskite ABO 3 structure and exhibits structural disorders on the nanoscale because of the mixed site occupancy of Na þ1 and Bi þ3 ions at A-site. [13][14][15][16][17][18][19][20] The aliovalent partial order or disorder of cations at A-site was understood to be the reason behind the anomalous properties and the intriguing structures. 21,22 BNT is commonly accepted to exhibit rhombohedral R3c and monoclinic Cc structures at room temperature.…”