文献类型：期刊文献

英文题名：Designing a glass nanoshell on barium titanium trioxide to suppress nanocrystal growth during sintering for fine-grain dielectric ceramics

作者：Yu, Jia[1];Jiang, Qi[1,2];Jia, Qingchao[1,2];Zhang, Liangzhu[1,2];Chiu, Wenchun[3];Zeng, Huidan[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 200237, Peoples R China;[3]UBrignt Optron Corp, Taoyuan 335002, Taiwan

年份：2025

卷号：11

期号：2

外文期刊名：JOURNAL OF MATERIOMICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001330800500001)】；

基金：This work was supported by the National Natural Science Foundation of China (NSFC 52072122 and 52272001) and Shanghai Pujiang Program (23PJ140200 0) . We thank A/Prof. Zheng Liu from Shanghai Institute of Ceramics for valuable discussion and suggestions.

语种：英文

外文关键词：BaTiO3; Core-shell; Fine crystallization; Bi2O3-B2O3-SiO2; Core-shell; Fine crystallization

摘要：Barium titanate (BaTiO3, BT) is one of the key dielectric materials for multilayer ceramic capacitor (MLCC) industry. To meet the development trend of miniaturization and high capacity of MLCC, the sintered ceramic with nanosized grain is required. Herein, we demonstrate a controllable preparation of fine-grain BaTiO3 ceramic by using sol-gel glass encapsulation strategy to suppress the growth of nanocrystal during sintering. It is found that the BaTiO3 nanocrystal with average lateral particle size of 70 nm and 200 nm (BT70 and BT200) can be coated with Bi2O3-B2O3-SiO2 (BBS) glass shell to form core-shell structures. The fine crystal of barium titanate ceramics can be achieved under different encapsulation quantities and sintering temperature. However, BT70, with a larger specific surface area, higher reactivity, and lower crystallinity, was more prone to hydrolyze in the sol-gel process, leading to the formation of a new phase after sintering, Ba2TiSi2O8, which adversely affected both the sintering behavior and dielectric properties. On the other hand, BT200 exhibited lower possibility to hydrolyze in the sol-gel process, resulting in single-phase ceramics after sintering. When the BT200 coated with 5% (in mass) BBS was sintered at 1100degree celsius, a dense BaTiO3 ceramic were obtained, with dielectric constant of 1194.23 and loss of 0.0139 at room temperature and 1 kHz. Therefore, this work provides a robust strategy for suppressing the nanocrystal growth during sintering for MLCC applications. (c) 2024 The Authors. Published by Elsevier B.V. on behalf of The Chinese Ceramic Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).