Crystallographic structure- and texture-dependent fracture behavior of polycrystalline lead zirconate titanate ceramics

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2021-09-29 DOI:10.1007/s10832-021-00270-7

Yingwei Li, Xueyao Wang, Guan Duan, Zeji Chen, Jianfeng Jin

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Abstract

The effect of crystallographic structure and texture on the fracture behavior of lead zirconate titanate (PZT) ceramics was investigated. PZT ceramics with Zr/Ti ratio of 45/55 (tetragonal, T), 52/48 (morphotropic phase boundary, MPB), and 60/40 (rhombohedral, R) were fabricated, and then textured using electric field and/or mechanical stress. Vickers indentation method was employed to characterize their fracture behavior. Results show that the unpoled specimen exhibits fracture toughness isotropy, with values of 1.24 MPa·m^1/2, 1.07 MPa·m^1/2, 1.17 MPa·m^1/2 for T, MPB, and R, respectively. The textured specimen reveals fracture toughness anisotropy (FTA). The largest FTA was observed for the mechanically (M) poled specimens. Additionally, FTA for the MPB composition was larger than the T and R specimens. The crystallographic structure and texture dependent domain switching behavior, and the parameters of coercive stress and Young’s modulus measured by mechanical compression are used to explain the observed phenomena.

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锆钛酸铅多晶陶瓷的晶体结构与织构断裂行为

研究了锆钛酸铅(PZT)陶瓷的晶体结构和织构对其断裂行为的影响。制备了Zr/Ti比值分别为45/55(四边形)、52/48(亲晶相界)和60/40(菱形)的PZT陶瓷，并利用电场和/或机械应力进行织构。采用维氏压痕法对其断裂行为进行表征。结果表明:未极化试样具有断裂韧性各向同性，T、MPB和R分别为1.24 MPa·m1/2、1.07 MPa·m1/2、1.17 MPa·m1/2;织构试样呈现断裂韧性各向异性(FTA)。在机械(M)极化试样中观察到最大的FTA。此外，MPB组分的FTA大于T和R试样。用晶体结构和织构相关的畴切换行为以及机械压缩测量的矫顽力和杨氏模量参数来解释观察到的现象。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.