掺铌 0.7BiFeO3-0.3BaTiO3 陶瓷的宽带介电光谱学

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-06-07 DOI:10.1088/2399-6528/ad55a2

Vadzim Haronin, Ziqi Yang, R. Grigalaitis, Ilkan Calisir, J. Banys, David Hall

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引用次数: 0

摘要

铁氧体钛酸钡铋（BF-BT）固溶体是一种无铅铁电材料，有望成为高温压电传感器的基础材料。本文利用宽带介电光谱研究了此类材料的介电特性。研究重点是掺铌 BF-BT 陶瓷的重入弛豫铁电行为，探索了大约 20 Hz 到 30 GHz 的宽频率范围和 200 到 500 K 的温度范围。利用科尔-科尔模型对介质色散进行了定量分析，该模型经过修改，以考虑低频/高温下的传导损耗。分析结果表明，极性纳米区域的凝固温度约为 158 K，活化能为 0.194 eV。这些发现有助于理解 BiFeO3-BaTiO3 陶瓷的介电弛豫机制和功能特性的热演化。

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Broadband dielectric spectroscopy of Nb-doped 0.7BiFeO3-0.3BaTiO3 ceramics

Bismuth ferrite-barium titanate (BF-BT) solid solutions are lead-free ferroelectrics that show great promise as the basis for high temperature piezoelectric transducers. This article investigates the dielectric properties of such materials using broadband dielectric spectroscopy. The study focuses on the re-entrant relaxor ferroelectric behaviour of Nb-doped BF-BT ceramics, exploring a wide frequency range from approximately 20 Hz to 30 GHz and temperature from 200 to 500 K. The results reveal the presence of thermally induced transitions between ordered and disordered states. Quantitative analysis of the dielectric dispersion is accomplished using the Cole-Cole model, modified to account for the contribution from conduction losses at low frequencies/high temperatures. This analysis revealed that the freezing temperature of the polar nanoregions is around 158 K, with an activation energy of 0.194 eV. The findings contribute to understanding the dielectric relaxation mechanisms and thermal evolution of functional properties in BiFeO3-BaTiO3 ceramics.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.