Impact of two-step calcination on microstructure, phase, electronic, and dielectric properties of KCa2Nb3O10 bulk layered perovskite

IF 2.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Asian Ceramic Societies Pub Date : 2023-01-02 DOI:10.1080/21870764.2023.2174243

Jeongyoul Kim, Jong-Chan Lim, Sang‐il Kim, Seong-Mee Hwang, W. Shin, Heesun Yang, Kyu Hyoung Lee, Hyun-sik Kim

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引用次数: 1

Abstract

ABSTRACT The effects of varying calcination temperature, K content, and the number of calcination steps in the dielectric performance of KCa2Nb3O10 synthesized via solid-state reaction are investigated. Adding an extra calcination step at 500°C followed by another calcination at 1100°C suppressed the formation of secondary phases while maximizing the relative density (95%) and the average grain area (2.12 μm2). The first calcination at 500°C ensures the formation of intermediate phases (KNbO3 and Ca2Nb2O7), which are prerequisites for single-phase KCa2Nb3O10 synthesis. A significantly high dielectric constant of 352 at 100k Hz is achieved in the two-step calcined sample despite the low sintering temperature of 1250°C. The highest resistivity of the two-step calcined sample (2 × 108 Ω cm) obtained from complex impedance analysis supports its lowest dielectric loss (0.034 at 100k Hz). When the two-step calcined KCa2Nb3O10 powder is exfoliated, much higher dielectric properties of Ca2Nb3O10 nanosheets are expected.

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两步煅烧对KCa2Nb3O10块状层状钙钛矿微观结构、相、电子和介电性能的影响

摘要研究了不同煅烧温度、K含量和煅烧步数对固态反应合成的KCa2Nb3O10介电性能的影响。在500°C下添加额外的煅烧步骤，然后在1100°C下再次煅烧，抑制了二次相的形成，同时最大化了相对密度（95%）和平均晶粒面积（2.12μm2）。在500°C下的第一次煅烧确保了中间相（KNbO3和Ca2Nb2O7）的形成，这是单相KCa2Nb3O10合成的先决条件。尽管烧结温度为1250°C，但在两步煅烧的样品中，在100kHz下获得了352的显著高介电常数。通过复阻抗分析获得的两步煅烧样品的最高电阻率（2×108Ωcm）支持其最低的介电损耗（100kHz时为0.034）。当两步煅烧的KCa2Nb3O10粉末剥落时，预计Ca2Nb3O10纳米片的介电性能会高得多。

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

Journal of Asian Ceramic Societies Materials Science-Ceramics and Composites

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

10 weeks

期刊介绍： The Journal of Asian Ceramic Societies is an open access journal publishing papers documenting original research and reviews covering all aspects of science and technology of Ceramics, Glasses, Composites, and related materials. These papers include experimental and theoretical aspects emphasizing basic science, processing, microstructure, characteristics, and functionality of ceramic materials. The journal publishes high quality full papers, letters for rapid publication, and in-depth review articles. All papers are subjected to a fair peer-review process.