Na0.5Bi0.5TiO3纳米纤维的制备及形成机理研究

doi:10.3724/SP.J.1077.2011.01251

无机材料学报 ›› 2011, Vol. 26 ›› Issue (12): 1251-1255.DOI: 10.3724/SP.J.1077.2011.01251 CSTR: 32189.14.SP.J.1077.2011.01251

Na_0.5Bi_0.5TiO₃纳米纤维的制备及形成机理研究

马晓, 薛丽红, 严有为

(华中科技大学模具技术国家重点实验室, 武汉 430074)

收稿日期:2010-12-27 修回日期:2011-03-02 出版日期:2011-12-20 网络出版日期:2011-11-11
作者简介:马晓(1987-), 男, 博士研究生. E-mail: mxhuster@163.com
基金资助:
国家自然科学基金(51002054); 湖北省自然科学基金(2008CB252); 中央高校基本业务费资助, HUST (2011TS014)

Hydrothermal Synthesis of Bismuth Sodium Titanate Nanowires and Forming Mechanism

MA Xiao, XUE Li-Hong, YAN You-Wei

(State Key Laboratory of Materials Processing and Die Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China)

Received:2010-12-27 Revised:2011-03-02 Published:2011-12-20 Online:2011-11-11
About author:MA Xiao.E-mail: mxhuster@163.com
Supported by:
National Natural Science Foundation of China (51002054); Natural Science Foundation of Hubei Province of China (2008CB252); Fundamental Research Funds for the Central Universities, HUST (2011TS014)

摘要/Abstract

摘要： 以Bi(NO₃)₃-5H₂O、板状钛酸(H_1.07Ti_1.73O₄-nH₂O)、NaOH为原料, 采用水热法合成了具有钙钛矿结构的Na_0.5Bi_0.5TiO₃纳米纤维. 利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)和X射线能谱仪(EDS)对产物进行表征. 通过考察在200℃下水热反应不同时间的产物的相结构、微观形貌及化学组成, 对Na_0.5Bi_0.5TiO₃纳米纤维的形成机理进行了探讨. 结果表明: 钛酸H_1.07Ti_1.73O₄-nH₂O是一类具有层板结构的化合物, 在水热反应过程中, 板状钛酸的层间H₃O⁺可与Na⁺、Bi³⁺进行离子交换, 通过原位生长的方式形成了板状Na_0.5Bi_0.5TiO₃颗粒, 随着水热反应的进行, 板状Na_0.5Bi_0.5TiO₃颗粒裂解形成纳米纤维. 所得的Na_0.5Bi_0.5TiO₃纳米纤维分散性好, 具有钙钛矿结构, 直径为30~150 nm, 长度为几个微米到十几个微米.

关键词: 水热合成, 钛酸铋钠, 纳米纤维, 钙钛矿相, 机理

Abstract: The Na_0.5Bi_0.5TiO₃ nanowires with perovskite structure were successfully synthesized by the hydrothermal method using Bi(NO₃)₃-5H₂O, H_1.07Ti_1.73O₄-nH₂O and NaOH as the starting materials. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and energy dispersive spectroscope (EDS), respectively. The phase structure, morphology, and chemical compositions of products synthesized at 200℃ by hydrothermal process for different times were investigated and the forming mechanism of nanowires was introduced. The results indicate that H_1.07Ti_1.73O₄-nH₂O is a compound with lepidocrocite-like layered structure, and the Na⁺, Bi³⁺ ions can exchange with H₃O⁺ in the interlay space of plate-like titanates in the hydrothermal process. Then the plate-like titanates are transformed into plate-like Na_0.5Bi_0.5TiO₃ particles by in situ reaction. With the hydrothermal reaction progressing, the plate-like Na_0.5Bi_0.5TiO₃ particles split into nanowires. The nanowires are well dispersed with perovskite structure. The width of nanowire is ranging from 30 nm to 150 nm and the length is about several micrometers to tens of micrometers.

Key words: hydrothermal synthesis, bismuth sodium titanate, nanowires, perovskite, forming mechanism

中图分类号:

TM22

马晓, 薛丽红, 严有为. Na_0.5Bi_0.5TiO₃纳米纤维的制备及形成机理研究[J]. 无机材料学报, 2011, 26(12): 1251-1255.

MA Xiao, XUE Li-Hong, YAN You-Wei. Hydrothermal Synthesis of Bismuth Sodium Titanate Nanowires and Forming Mechanism[J]. Journal of Inorganic Materials, 2011, 26(12): 1251-1255.

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Na_0.5Bi_0.5TiO₃纳米纤维的制备及形成机理研究

Hydrothermal Synthesis of Bismuth Sodium Titanate Nanowires and Forming Mechanism

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