Li+不等量取代对Ca3Co2SiV2O12烧结特性和微波介电性能的调制

IF 9.6 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Zhenli Tao, Jiamao Li, Junxian Wang, Yuxuan Ren, Yunfeng Guo, Qinghe Yang, Zhihao Yuan, Rui Tian, Wenbo Wang
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引用次数: 0

摘要

在本研究中,设计了Ca3Co2SiV2O12化合物中Li+的不等量取代Ca2+来调节其烧结特性和微波介电性能。采用常规固相法制备相应的Ca3-xLi2xCo2SiV2O12 (CCSV-xLi, 0.01≤x≤0.07)陶瓷,在1140℃以下的温度下烧结致密。Rietveld细化结果表明,当x≤0.05时,所有掺杂的Li都占据了ca位点,而当x = 0.07时,多余的Li位于CLCSV的co位点。这种原子占据对“咔嗒效应”的程度有显著影响,从而调节了陶瓷的相对介电常数,在x = 0.01-0.05处不断增大,在x = 0.07处略有减小。拉曼光谱显示Q×f值与拉曼位移和FWHM密切相关。同时,Q×f值部分受氧空位浓度的影响。τf值表现出与a位键价相反的趋势,并受到“咔嗒效应”的影响。在1120℃下烧结的CCSV-0.05Li陶瓷具有优异的微波介电性能:εr = 12.17, Q×f = 56,220 GHz, τf = -8.5×10−6°C−1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Modulation in sintering characteristics and microwave dielectric properties of Ca3Co2SiV2O12 via Li+ inequivalent substitution

Modulation in sintering characteristics and microwave dielectric properties of Ca3Co2SiV2O12 via Li+ inequivalent substitution

Modulation in sintering characteristics and microwave dielectric properties of Ca3Co2SiV2O12 via Li+ inequivalent substitution
In this study, the inequivalent substitution of Ca2+ by Li+ in the Ca3Co2SiV2O12 compound was designed to modulate its sintering characteristics and microwave dielectric properties. The corresponding Ca3–xLi2xCo2SiV2O12 (CCSV-xLi, 0.01≤ x ≤ 0.07) ceramics were prepared via the conventional solid-state phase method, which could be densely sintered at a temperature below 1140 °C. Rietveld refinement results suggested that all the doped Li occupied the Ca-site as x ≤ 0.05 while superfluous Li positioned at the Co-site of CCSV when x = 0.07. This atomic occupancy had a remarkable effect on the degree of “rattling effect” and thus modulated the relative permittivity of ceramics, constantly increasing at x = 0.01–0.05 and slightly decreasing at x = 0.07. Raman spectra revealed that Q×f value was closely related to Raman shift and FWHM. Also, the Q×f value was partly influenced by oxygen vacancy concentration. The τf demonstrated an opposite tendency to the bond valence of the A-site and was affected by the “rattling effect”. The CCSV-0.05Li ceramic sintered at 1120 °C possessed excellent microwave dielectric properties: εr = 12.17, Q×f = 56,220 GHz, and τf = −8.5 × 10−6 °C−1.
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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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