Structural evolution and electrical properties of a new xNa0.5Bi2.5Nb2O9-(1-x)Bi3TiNbO9 solid solution for high-temperature piezoelectric ceramics

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-01 DOI:10.1016/j.jallcom.2025.184164

Zhipeng Zhang, Yaxian Li, Zong-Yang Shen, Qilai Wen, Haosong Wu, Zhumei Wang, Wenqin Luo

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Abstract

In this work, a new solid solution xNa_0.5Bi_2.5Nb₂O₉-(1-x)Bi₃TiNbO₉ (abbreviated as xNBN-(1-x)BTN, x=0-1) ceramics with bismuth layered structure were synthesized via solid state reaction method, and structural evolution and electrical properties were systematically investigated. The orthorhombic distortion of xNBN-(1-x)BTN ceramics decreases with the increase of NBN content. The Curie temperature T_C gradually decreases from 885.7 ^oC of pure BTN to 764.5 ^oC of pure NBN with the increase of x value. For the composition of x=0.7, the remnant polarization is enhanced due to the decrease of orthogonal distortion, and the optimized electrical properties can be achieved as follows: enhanced piezoelectric coefficient d₃₃=17.1 pC/N, high Curie temperature T_C=777.4 ^oC, a large remnant polarization P_r=10.1 μC/cm², increased DC resistivity ρ=1.68×10⁷ Ω·cm and very low dielectric loss tanδ=2.4% at 500 ^oC. In addition, the 0.7NBN-0.3BTN ceramics also possesses excellent thermal stability, maintaining 88% of its initial d₃₃ value even after depolarization at 750 ^oC, great potential for high-temperature piezoelectric sensor applications. This work provides an effective strategy for improving the properties of bismuth layer-structured ferroelectrics (BLSFs) by constructing solid solutions.

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新型高温压电陶瓷xNa0.5Bi2.5Nb2O9-(1-x)Bi3TiNbO9固溶体的结构演变与电学性能

本文采用固相反应法制备了具有铋层状结构的新型固溶体xNa0.5Bi2.5Nb2O9-(1-x)Bi3TiNbO9（简称xNBN-(1-x)BTN, x=0-1）陶瓷，并对其结构演化和电学性能进行了系统的研究。xNBN-(1-x)BTN陶瓷的正交畸变随NBN含量的增加而减小。随着x值的增大，居里温度TC从纯BTN的885.7 oC逐渐降低到纯NBN的764.5 oC。当x=0.7时，由于正交畸变的减小，残余极化增强，得到了优化的电学性能：增强的压电系数d33=17.1 pC/N，高居里温度TC=777.4 oC，较大的残余极化Pr=10.1 μC/cm2，增大的直流电阻率ρ=1.68×107 Ω·cm， 500 oC时极低的介电损耗tanδ=2.4%。此外，0.7NBN-0.3BTN陶瓷还具有优异的热稳定性，即使在750℃下去极化后仍能保持初始d33值的88%，在高温压电传感器应用中具有很大的潜力。这项工作为通过构建固溶体来改善铋层结构铁电体（BLSFs）的性能提供了一种有效的策略。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.