Effect of Sr2+ on phase structure and properties for 0.6(Na0.5Bi0.5)TiO3-0.4(Bi1-Sr )TiO3 relaxor ferroelectrics

Zhao, Fengxin; He, Qiang; Bai, Qinzhong; Wu, Wenjuan; Wu, Bo; Chen, Min

doi:10.1016/j.ceramint.2019.10.031

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…As for BNT‐based ferroelectric materials, their superior electro‐strain with negligible hysteresis can be rationalized by the relaxor theory, which is attracting more and more attention in recent years 19,43 . At the ferroelectric‐relaxor phase transition temperature T F‐R , large‐sized ferroelectric domains transform into small‐sized PNRs, accompanied with the formation of nonergodic relaxor (NR) and ergodic relaxor (ER) phases 44,45 .…”

Section: Introductionmentioning

confidence: 99%

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

et al. 2020

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For ferroelectric electrostrictors, shifting their Curie temperature T C to the ambient temperature is an effective way to enhance their electrostrictive effect. However, the enhanced electrostrictive coefficient Q 33 in this way is often accompanied with an inferior electro-strain. In this work, by introducing CaZrO 3 /BaZrO 3 as the special kind of solid solution, with an effective regulation on the ergodic state, we simultaneously realize a larger room-temperature electrostrictive coefficient Q 33 (~0.04337 m 4 /C 2) with a superior electro-strain (~0.41%) in Bi 0.5 Na 0.5 TiO 3-based relaxor ferroelectric ceramics. The ions substitution with larger radius in either A-site or B-site of perovskite structure tends to facilitate the evolution from ferroelectric tetragonal phase P4mm to relaxor tetragonal phase P4bm along with the decrease in polarity in crystal, thereby shifting the transition temperature T F-R below room temperature. As a result of the effective regulation on the ergodic state, a large electro-strain with low hysteresis, just like electrostrictors, is successfully realized in BNT-based ferroelectric ceramics. Our investigation provides an effective way to simultaneously enhance the electrostrictive coefficient Q 33 and electro-strain for practical applications in precisely controlled displacement.

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Section: Introductionmentioning

confidence: 99%

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

et al. 2020

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“…Sometimes, the compositions with larger values of Q 33 are considered more appropriate for practical application in actuators. 25 However, more important for a practical application are the values of strain and the corresponding electric field, 26 even considering that strains' dependence on the electric field cannot be characterized by a single parameter, such as Q 33 . For example, a strain value of u = 0.2%, obtained in the present study with x = 0.100 at 65 kV/cm, while for PMN-PT, the same strain is obtained at 20 kV/cm.…”

Section: Resultsmentioning

confidence: 99%

Electromechanical properties in CaTiO3 modified Na0.5Bi0.5TiO3-BaTiO3 solid solutions above morphotropic phase boundary

et al. 2022

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The structural, electromechanical, and dielectric properties of (1 − x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)-xCaTiO3 [(1 − x) (0.8NBT-0.2BT)-xCT] ceramics are studied as candidates for room temperature actuators with high field-induced strain. The choice of 0.8NBT-0.2BT as a starting composition is motivated by the large tetragonality in this concentration range, even though it is located far away from the morphotropic phase boundary. CaTiO3 was chosen as a third component to decrease the depolarization temperature and achieve a high field-induced strain at room temperature. The measured strains at the field-induced phase transition are remarkably lower than might be expected from the jump in unit cell parameters at the phase transition. This inconsistency could be related to an incomplete field-induced phase transition from the ferroelectric phase to the nonpolar phase. Among all of the manufactured samples, the phase transition is close to room temperature in the composition with x = 0.100, which allows obtaining unipolar strains up to 0.23% at E = 65 kV/cm. Electrostrictive-like strain was observed not only above the depolarization temperature but also in the region of field-induced phase transition.

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Estimation of relaxor behavior in Sr2+ doped Na0.5Bi0.5TiO3 ceramics

Praharaj

Rout

2020

J Mater Sci: Mater Electron

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Effect of Sr2+ on phase structure and properties for 0.6(Na0.5Bi0.5)TiO3-0.4(Bi1-Sr )TiO3 relaxor ferroelectrics

Cited by 9 publications

References 23 publications

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

Electromechanical properties in CaTiO3 modified Na0.5Bi0.5TiO3-BaTiO3 solid solutions above morphotropic phase boundary

Estimation of relaxor behavior in Sr2+ doped Na0.5Bi0.5TiO3 ceramics

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