Electromechanical properties of different phases in ferroelectric crystals regulated by variously oriented electric fields

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials Pub Date : 2024-10-18 DOI:10.1016/j.mechmat.2024.105183

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引用次数: 0

Abstract

Electric fields offer a convenient and tunable way to induce phase transitions for regulating the electromechanical properties of ferroelectrics. However, regulating the electromechanical properties by using electric fields in various directions for different ferroelectric phases has yet to be systematically investigated, especially for lead-free material KNbO₃. Based on the nonlinear thermodynamics analysis, the electric field-temperature phase diagrams of KNbO₃ single crystals under different electric field directions (E_[001], E_[011], E_[111]) have been constructed, along with the electric-field-induced electromechanical responses. The results show that the phase diagrams are markedly different under different electric field directions. Specifically, the electric field-temperature phase diagram appears as a "line"-shaped phase boundary under E_[001], while it appears as a "U"-shaped phase boundary under E_[011], and an arrowhead-shaped phase boundary under E_[111]. It is also found that there are excellent electromechanical responses near both "U"-shaped and arrowhead-shaped phase boundaries due to the significant alterations in polarization slopes near the phase boundaries, offering an alternative pathway to regulate and enhance the electromechanical properties in ferroelectrics.

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不同方向电场调节铁电晶体中不同相的机电特性

电场为诱导相变以调节铁电体的机电特性提供了一种方便且可调的方法。然而，利用不同方向的电场来调节不同铁电相的机电特性，尤其是无铅材料 KNbO3 的机电特性，还有待于系统研究。基于非线性热力学分析，我们构建了不同电场方向（E[001]、E[011]、E[111]）下 KNbO3 单晶的电场-温度相图以及电场诱导的机电响应。结果表明，在不同的电场方向下，相图明显不同。具体来说，电场-温度相图在 E[001] 下呈 "线 "形相界，在 E[011] 下呈 "U "形相界，在 E[111] 下呈箭头形相界。研究还发现，由于相界附近极化斜率的显著变化，"U "形相界和箭头形相界附近都有很好的机电响应，这为调节和增强铁电体的机电特性提供了另一种途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mechanics of Materials 工程技术-材料科学：综合

CiteScore

7.60

自引率

5.10%

发文量

243

审稿时长

46 days

期刊介绍： Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.