Effect of oleic acid on morphologies of BaTi5O11 nanocrystals synthesized by hydrothermal method

IF 0.7 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Materials Research Pub Date : 2023-12-14 DOI:10.1515/ijmr-2022-0490

Desheng Shi, Wensai Zhang, Long Liu, Renliang Wang, Zhixiong Huang, Dongyun Guo

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引用次数: 0

Abstract

Abstract BaTi5O11 nanocrystals were synthesized by a hydrothermal method, and the effect of oleic acid (OA) in the Ba–Ti precursors on morphologies of BaTi5O11 nanocrystals was investigated. As the OA/(Ba2+ + Ti4+) molar ratio ranged from 0 to 8, single-phase BaTi5O11 nanocrystals were synthesized at 260 °C for 20 h. When OA reagent was not added to the precursors, rice-like BaTi5O11 nanocrystals were obtained. As the OA/(Ba2+ + Ti4+) molar ratio was 1, elongated lath-like BaTi5O11 nanocrystals were synthesized with the width of about 130 nm, thickness of about 50 nm and length of about 400 nm. With increasing the OA/(Ba2+ + Ti4+) molar ratio from 1 to 6, the grain size of elongated lath-like BaTi5O11 nanocrystals gradually decreased. As the OA content increased, the amount of adsorbed OA molecules on the surface of Ti(OH) x nucleus increased and hindered the reaction of Ba2+ ions with Ti(OH) x nucleus, which caused the decrease of grain size of lath-like BaTi5O11 nanocrystals. When the BaTi5O11 nanocrystals were synthesized at OA/(Ba2+ + Ti4+) molar ratio of 1, they had the largest dielectric constant (εr) of 40.9 at 5 GHz.

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油酸对水热法合成的 BaTi5O11 纳米晶体形貌的影响

摘要采用水热法合成了BaTi5O11纳米晶体，并研究了Ba-Ti前驱体中油酸（OA）对BaTi5O11纳米晶体形貌的影响。当 OA/（Ba2+ + Ti4+）摩尔比在 0 至 8 之间时，单相 BaTi5O11 纳米晶体在 260 °C 下合成 20 小时。当前驱体中不添加 OA 试剂时，可获得米粒状的 BaTi5O11 纳米晶体。当 OA/（Ba2+ + Ti4+）摩尔比为 1 时，合成出拉长的板条状 BaTi5O11 纳米晶体，宽度约为 130 nm，厚度约为 50 nm，长度约为 400 nm。随着 OA/（Ba2+ + Ti4+）摩尔比从 1 增加到 6，细长的板条状 BaTi5O11 纳米晶体的晶粒尺寸逐渐减小。随着 OA 含量的增加，Ti（OH）x 晶核表面吸附的 OA 分子量增加，阻碍了 Ba2+ 离子与 Ti（OH）x 晶核的反应，从而导致板条状 BaTi5O11 纳米晶粒尺寸减小。当 OA/(Ba2+ + Ti4+) 摩尔比为 1 时合成的 BaTi5O11 纳米晶体在 5 GHz 下的介电常数（εr）最大，为 40.9。

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

International Journal of Materials Research 工程技术-冶金工程

CiteScore

1.30

自引率

12.50%

发文量

119

审稿时长

6.4 months

期刊介绍： The International Journal of Materials Research (IJMR) publishes original high quality experimental and theoretical papers and reviews on basic and applied research in the field of materials science and engineering, with focus on synthesis, processing, constitution, and properties of all classes of materials. Particular emphasis is placed on microstructural design, phase relations, computational thermodynamics, and kinetics at the nano to macro scale. Contributions may also focus on progress in advanced characterization techniques. All articles are subject to thorough, independent peer review.