多晶铁电BaTiO3中扩散介电行为和极性纳米区保留的中尺度机制

IF 8.4 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Lyubov Gimadeeva , Andrei Ushakov , Alexey Pugachev , Anton Turygin , Ruiyi Jing , Qingyuan Hu , Xiaoyong Wei , Zimeng Hu , Vladimir Shur , Li Jin , Denis Alikin
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引用次数: 0

摘要

钛酸钡是一种经典的铁电材料,在其向准电相转变的温度附近,在有序参数自发极化方面表现出跳变行为。这是一阶相变的教科书范例,以极性和非极性相区共存为标志。尽管有令人信服的证据表明,在居里温度(Tc)以上,相变逐渐发生,铁电性质部分保留,但相保留的微观机制尚不清楚。目前的研究采用互补的宏观和局部技术来解释多晶钛酸钡宏观特征的温度异常。我们的研究结果表明,极性相区域的保留是由带电缺陷驱动的,带电缺陷是空间非均匀内部电场的起源。这项研究的见解提供了对控制铁电行为的基本机制的更深入的理解,并为广泛的技术应用提供了相共存定制材料的新可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mesoscale mechanisms of the diffuse dielectric behaviour and retention of the polar nano-regions in the polycrystalline ferroelectric BaTiO3

Mesoscale mechanisms of the diffuse dielectric behaviour and retention of the polar nano-regions in the polycrystalline ferroelectric BaTiO3

Mesoscale mechanisms of the diffuse dielectric behaviour and retention of the polar nano-regions in the polycrystalline ferroelectric BaTiO3
Barium titanate is a classical ferroelectric material that exhibits a jump-like behavior in the order parameter, spontaneous polarization, near the temperature of its transition to the paraelectric phase. This serves as a textbook example of a first-order phase transition, marked by the coexistence of polar and non-polar phase regions. Despite compelling evidence of the gradual phase transformation across Curie temperature (TC) and partial retention of ferroelectric properties above TC, the microscopic mechanisms of the phase retention remain unclear. Current study explains temperature anomalies in the macroscopic characteristics of polycrystalline barium titanate by employing complementary macroscopic and local techniques. Our findings reveal that retention of the polar phase regions is driven by the charged defects, which act as the origin of the spatially non-uniform internal electric fields. The insights from this research offer a deeper understanding of the fundamental mechanisms governing ferroelectric behavior and open new possibilities for tailoring materials with phase coexistence for a wide range of technological applications.
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来源期刊
Journal of Materiomics
Journal of Materiomics Materials Science-Metals and Alloys
CiteScore
14.30
自引率
6.40%
发文量
331
审稿时长
37 days
期刊介绍: The Journal of Materiomics is a peer-reviewed open-access journal that aims to serve as a forum for the continuous dissemination of research within the field of materials science. It particularly emphasizes systematic studies on the relationships between composition, processing, structure, property, and performance of advanced materials. The journal is supported by the Chinese Ceramic Society and is indexed in SCIE and Scopus. It is commonly referred to as J Materiomics.
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