溶剂类型对一步水热法合成钛酸钡形貌和结构的影响

庞萧萧; 王婷婷; 刘斌; 范夏月; 刘晓瑞; 申静; 钟澄; 胡文彬

doi:10.1007/s12613-023-2614-9

Volume 30 Issue 7

Jul. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(7): 1407-1416

Xiaoxiao Pang, Tingting Wang, Bin Liu, Xiayue Fan, Xiaorui Liu, Jing Shen, Cheng Zhong, and Wenbin Hu, Effect of solvents on the morphology and structure of barium titanate synthesized by a one-step hydrothermal method, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1407-1416. https://doi.org/10.1007/s12613-023-2614-9

Cite this article as:

Xiaoxiao Pang, Tingting Wang, Bin Liu, Xiayue Fan, Xiaorui Liu, Jing Shen, Cheng Zhong, and Wenbin Hu, Effect of solvents on the morphology and structure of barium titanate synthesized by a one-step hydrothermal method, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1407-1416. https://doi.org/10.1007/s12613-023-2614-9

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研究论文

溶剂类型对一步水热法合成钛酸钡形貌和结构的影响

1)
天津大学材料科学与工程学院，天津 300072，中国
2)
重庆新申世纪新材料科技有限公司，重庆 401147，中国
3)
天津大学-新加坡国立大学福州联合学院，福州 350207，中国

通讯作者:
钟澄 E-mail: cheng.zhong@tju.edu.cn

文章亮点

(1) 系统研究了溶剂种类对一步水热法合成钛酸钡的晶体结构、形貌、粒径分布的影响规律。

(2) 结合溶剂的物理化学特性分析了一步水热法过程中的溶剂效应。

(3) 总结并提出了合成四方性高、形貌良好、粒径小的四方相钛酸钡纳米颗粒的最佳溶剂条件。

中文摘要

钛酸钡因其优异的介电、铁电、压电和热释电性能，在介电陶瓷工业，尤其是多层陶瓷电容器(MLCCs)中具有广阔的应用前景。近年来，随着电子器件向小型化和多功能化发展，对具有薄介电层和超高容量的MLCCs的需求显著增加，进而对钛酸钡粉体的晶体特性和粒径提出了更高的要求。本文通过简单的一步水热法合成了高四方性、形貌良好、粒径小的四方相钛酸钡，系统探究了溶剂种类对钛酸钡粉体的晶体结构、形貌特征、粒径分布等特性的影响规律。结果表明，在纯水、甲醇/水混合溶剂、乙醇/水混合溶剂、异丙醇/水混合溶剂条件下均能合成形貌良好的高纯度四方相钛酸钡粉体。四方性随内孔孔径的增大而减小，可以说明内孔缺陷的存在在一定程度上抑制了钛酸钡的四方性。在纯水中合成的钛酸钡颗粒尺寸最大，向反应介质中加入一元醇（甲醇、乙醇、异丙醇）后，粒径分布范围变窄，平均粒径均有所减小，并且按照异丙醇、乙醇和甲醇的顺序减小。最后，结合钛酸钡粉体的晶体特性和粒径形貌特性，确定了乙醇/水混合溶剂为一步水热法合成四方相钛酸钡的最佳溶剂条件，在此条件下合成的四方相钛酸钡具有1.0088的高四方性、良好的球形形貌、82 nm的小平均粒径，在多层陶瓷电容器中具有很大的实际应用前景。

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Research Article

Effect of solvents on the morphology and structure of barium titanate synthesized by a one-step hydrothermal method

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Abstract

Abstract

Tetragonal barium titanate was synthesized from barium hydroxide octahydrate and titanium tetrachloride through a simple one-step hydrothermal method. The effect of different solvents on the crystal structure and morphology of barium titanate nanoparticles during the hydrothermal process was investigated. Except for ethylene glycol/water solvent, impurity-free barium titanate was synthesized in pure water, methanol/water, ethanol/water, and isopropyl alcohol/water mixed solvents. Compared with other alcohols, ethanol promotes the formation of a tetragonal structure. In addition, characterization studies confirm that particles synthesized in methanol/water, ethanol/water, and isopropyl alcohol/water mixed solvents are smaller in size than those synthesized in pure water. In the case of alcohol-containing solvents, the particle size decreases in the order of isopropanol, ethanol, and methanol. Among all the media used in this study, ethanol/water is considered the optimum reaction media for barium titanate with high tetragonality (defined as the ratio of two lattice parameters c and a, c/a = 1.0088) and small average particle size (82 nm), which indicates its great application potential in multilayer ceramic capacitors.
- barium titanate;
- hydrothermal synthesis;
- tetragonality;
- solvent effects

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