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Research Article | Open Access

Optimized strain performance in <001>-textured Bi0.5Na0.5TiO3-based ceramics with ergodic relaxor state and core–shell microstructure

Xuefan ZHOU†, Huiping YANG†, Guoliang XUE, Hang LUO( ), Dou ZHANG( )
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

† Xuefan Zhou and Huiping Yang contributed equally to this work.

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Graphical Abstract

Abstract

Herein, a high strain of ~0.3% with a small hysteresis of 43% is achieved at a low electric field of 4 kV/mm in the highly <001>-textured 0.97(0.76Bi0.5Na0.5TiO3–0.24SrTiO3)–0.03NaNbO3 (BNT–ST–0.03NN) ceramics with an ergodic relaxor (ER) state, leading to a large normalized strain (d33*) of 720 pm/V. The introduction of NN templates into BNT–ST induces the grain orientation growth and enhances the ergodicity. The highly <001>-textured BNT–ST–0.03NN ceramics display a pure ergodic relaxor state with coexisted ferroelectric R 3¯c and antiferroelectric P4bm polar nanoregions (PNRs) on nanoscale. Moreover, due to the incomplete interdiffusion between the NN template and BNT–ST matrix, the textured ceramics present a core–shell structure with the antiferroelectric NN core, and thus the BNT-based matrix owns more R 3¯c PNRs relative to the homogeneous nontextured samples. The high <001> crystallographic texture and more R 3¯c PNRs both facilitate the relaxor-to-ferroelectric transition, leading to the low-field-driven high strain, while the ergodic relaxor state ensures a small hysteresis. Furthermore, the d33* value remains high up to 518 pm/V at 100 ℃ with an ultra-low hysteresis of 6%.

Keywords

core–shell structureBi0.5Na0.5TiO3 (BNT)-based ceramicsergodic relaxor (ER) state<001>crystallographic textureoptimized strain performance

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Journal of Advanced Ceramics
Volume 11 Issue 10,
October 2022
Pages 1542-1558
DOI: 10.1007/s40145-022-0628-9
Cite this article:
ZHOU X, YANG H, XUE G, et al. Optimized strain performance in <001>-textured Bi0.5Na0.5TiO3-based ceramics with ergodic relaxor state and core–shell microstructure. Journal of Advanced Ceramics, 2022, 11(10): 1542-1558. https://doi.org/10.1007/s40145-022-0628-9

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Received: 06 April 2022
Revised: 14 June 2022
Accepted: 27 June 2022
Published: 21 August 2022
© The Author(s) 2022.

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