Dielectric properties of mechanically activated strontium titanate ceramics

IF 1.4 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Science of Sintering Pub Date : 2022-01-01 DOI:10.2298/sos2204401z

J. Živojinović, D. Kosanović, V. Blagojević, V. Pavlović, N. Tadic, B. Vlahovic, V. Pavlović

引用次数: 1

Abstract

In this study, microstructure evolution and dielectric properties of SrTiO3 ceramic have been investigated, whereby mechanical activation of SrTiO3 powders was used to modify the functional properties of ceramic materials. Microstructural SEM analysis of SrTiO3 ceramics showed that the increase in mechanical activation time results in less porous samples. Raman spectroscopy indicated changes in the broadening and asymmetry of the TO2 mode with a change in the time of mechanical activation. TO2 mode showed a Fano asymmetry due to its interaction with polarization fluctuations in polar micro-regions, which are a consequence of the presence of oxygen vacancies caused by activation. The maximum value of dielectric permittivity was observed in the sample activated for 10 min. Also, the sample activated for 10 min exhibits relatively low values of loss tangent, compared to the other mechanically activated samples, providing the best overall dielectric performance compared to other samples.

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机械活化钛酸锶陶瓷的介电性能

在本研究中，研究了SrTiO3陶瓷的微观结构演变和介电性能，并利用SrTiO3粉末的机械活化来修饰陶瓷材料的功能性能。SrTiO3陶瓷的微观结构SEM分析表明，机械活化时间的增加导致样品的孔隙减少。拉曼光谱显示TO2模式的展宽和不对称性随机械活化时间的变化而变化。TO2模式表现出Fano不对称，这是由于其与极性微区极化波动的相互作用，而极化波动是由活化引起的氧空位的存在造成的。在活化10分钟的样品中观察到介电常数的最大值。此外，与其他机械活化样品相比，活化10分钟的样品表现出相对较低的损耗正切值，与其他样品相比，提供了最佳的整体介电性能。

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

Science of Sintering 工程技术-材料科学：硅酸盐

CiteScore

2.50

自引率

46.70%

发文量

审稿时长

3.3 months

期刊介绍： Science of Sintering is a unique journal in the field of science and technology of sintering. Science of Sintering publishes papers on all aspects of theoretical and experimental studies, which can contribute to the better understanding of the behavior of powders and similar materials during consolidation processes. Emphasis is laid on those aspects of the science of materials that are concerned with the thermodynamics, kinetics and mechanism of sintering and related processes. In accordance with the significance of disperse materials for the sintering technology, papers dealing with the question of ultradisperse powders, tribochemical activation and catalysis are also published. Science of Sintering journal is published four times a year. Types of contribution: Original research papers, Review articles, Letters to Editor, Book reviews.