优化 BNT 基陶瓷的电应变，使 MPB 处的滞后最小化

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-11-13 DOI:10.1016/j.jeurceramsoc.2024.117073

Xinru Nie , Ruiyi Jing , Yule Yang , Yangxi Yan , Vladimir Laletin , Vladimir Shur , Guan Wang , Li Jin

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引用次数: 0

摘要

无铅（Bi0.5Na0.5）TiO3（BNT）基陶瓷由于在外加电场作用下具有明显的电应变响应，因此在传感器和感应器中发挥着重要作用。这项研究在 (1-x)BNT-x(Ba0.15Sr0.55Ca0.3)TiO3 (x = 0.2-0.4, BNT-xBSCT)陶瓷的形态相边界 (MPB) 附近的 x = 0.30 成分中，发现了 0.54 % 的显著电应变响应和最小的电应变滞后 (11%)。通过利用钛酸盐掺杂带来的容限因子变化和 A 位多离子置换带来的局部无序，我们通过非极性弛豫体（NR）和极性弛豫体（ER）相界的演化增强了电应变响应。值得注意的是，x = 0.30 成分表现出超高的电应变（0.5%），在 70 °C 以上具有显著的热稳定性。这种稳定性源于 ER/NR 混合相中的畴翻转和可逆电场诱导的弛豫相到铁电相转变的共同作用。这些结果为提高无铅 BNT 基陶瓷的电应变性能和热稳定性提供了巨大的潜力。

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Optimized electrostrain with minimal hysteresis at the MPB in BNT-based ceramics

Lead-free (Bi_0.5Na_0.5)TiO₃ (BNT)-based ceramics play a vital role in transducers and sensors, owing to their pronounced electrostrain response under applied electric fields. This work presents a notable electrostrain response of 0.54 % with minimal electrostrain hysteresis (11 %) in the x = 0.30 composition near the morphotropic phase boundary (MPB) within (1–x)BNT-x(Ba_0.15Sr_0.55Ca_0.3)TiO₃ (x = 0.2–0.4, BNT-xBSCT) ceramics. By exploiting the variation in tolerance factor through titanate doping and localized disorder from A-site multiple ion substitution, we achieved enhanced electrostrain response via the evolution of nonergodic relaxor (NR) and ergodic relaxor (ER) phase boundaries. Notably, the x = 0.30 composition exhibits ultrahigh electrostrain (>0.5 %) with remarkable thermal stability above 70 °C. This stability arises from the combined effects of domain flipping in ER/NR mixed phases and reversible electric field-induced relaxor-to-ferroelectric phase transitions. These results hold significant potential for advancing electrostrain performance and thermal stability in lead-free BNT-based ceramics.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.