Topochemical conversion of protonated titanate single crystals into platelike Ba0.5Sr0.5TiO3 mesocrystals with controllable microstructures

Dengwei Hu; Xin Luo; Xingang Kong; Yan Wang; Yasuhiro Tanaka; Qi Feng

doi:10.1039/C4CE02299H

Topochemical conversion of protonated titanate single crystals into platelike Ba_0.5Sr_0.5TiO₃ mesocrystals with controllable microstructures†

Dengwei Hu,^ab Xin Luo,^b Xingang Kong,^c Yan Wang,^a Yasuhiro Tanaka^b and Qi Feng*^b

* Corresponding authors

^a Department of Chemistry and Chemical Engineering, Baoji University of Arts and Science, 1 Gaoxin Road, Baoji, Shaanxi, PR China
E-mail: feng@eng.kagawa-u.ac.jp
Fax: +81 (0)87 864 2402
Tel: +81 (0)87 864 2402

^b Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu-shi, Japan

^c School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi, 710021 PR China

Abstract

This report introduces a platelike Ba_0.5Sr_0.5TiO₃ (BST) mesocrystal synthesized by a two-step solvothermal soft chemical process. In the first step, a platelike layered titanate H_1.07Ti_1.73□_0.27O₄·xH₂O (□: vacancy of Ti) (HTO) single crystal is treated in a Ba(OH)₂ solution to obtain a platelike BaTiO₃ (BT)/HTO/anatase nanocomposite. In the second step, the generated BT/HTO/anatase nanocomposite is treated in a Sr(OH)₂ solution to obtain the platelike BST mesocrystal. The formation mechanism and nanostructure of the mesocrystal are investigated by XRD, TEM, SAED, and FESEM. The platelike BST mesocrystal is constructed from [110]-oriented BST nanocrystals and shows a set of single-crystal-like electron diffraction spots. The mesocrystal is formed via an in situ topochemical mesocrystal conversion mechanism. There is a definite relationship between the crystal-axis directions of the HTO precursor and the BST mesocrystal. The platelike BST mesocrystals with uniform microstructure and high crystallinity can be achieved by controlling the ethanol content in the reaction solvent.

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Article information

DOI: https://doi.org/10.1039/C4CE02299H
Article type: Communication
Submitted: 20 Nov 2014
Accepted: 17 Jan 2015
First published: 20 Jan 2015

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CrystEngComm, 2015,17, 1758-1764

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Topochemical conversion of protonated titanate single crystals into platelike Ba_0.5Sr_0.5TiO₃ mesocrystals with controllable microstructures

D. Hu, X. Luo, X. Kong, Y. Wang, Y. Tanaka and Q. Feng, CrystEngComm, 2015, 17, 1758 DOI: 10.1039/C4CE02299H

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