Topological relations and piezoelectric responses of crystal-axis-oriented BaTiO3/CaTiO3 nanocomposites

Dengwei Hu; Xiaomei Niu; Hao Ma; Wenxiong Zhang; Galhenage A. Sewvandi; Desuo Yang; Xiaoling Wang; Hongshei Wang; Xingang Kong; Qi Feng

doi:10.1039/C7RA03828C

Topological relations and piezoelectric responses of crystal-axis-oriented BaTiO₃/CaTiO₃ nanocomposites†

Dengwei Hu,

*^a Xiaomei Niu,^a Hao Ma,^b Wenxiong Zhang,^b Galhenage A. Sewvandi,^c Desuo Yang,^a Xiaoling Wang,

^a Hongshei Wang,^a Xingang Kong^d and Qi Feng

*^b

Author affiliations

* Corresponding authors

^a College of Chemistry and Chemical Engineering, Engineering Research Center of Advanced Ferroelectric Functional Materials, Key Laboratory of Phytochemistry of Shaanxi Province, Baoji University of Arts and Sciences, 1 Hi-Tech Avenue, Baoji, Shaanxi, 721013 P. R. China
E-mail: hdwpolymer@yahoo.co.jp
Fax: +86-917-356-6366
Tel: +86-917-356-6589

^b Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu-shi, 761-0396 Japan
E-mail: feng@eng.kagawa-u.ac.jp
Fax: +81-87-864-2438
Tel: +81-87-864-2402

^c Department of Materials Science and Engineering, Faculty of Engineering, University of Moratuwa, Katubedda, Sri Lanka

^d School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi, 710021 P. R. China

Abstract

2D crystal-axis-oriented mesocrystalline BaTiO₃/CaTiO₃ (BT/CT) nanocomposites with high-density heteroepitaxial interfaces were synthesized by a two-step solvothermal soft chemical process. The nanostructures, formation mechanism, topological relations between the BT and CT, and piezoelectric responses of the nanocomposites were investigated. The mesocrystalline nanocomposites are polycrystals constructed from crystal-axis-oriented BT and CT nanocrystals with the same crystal-axis orientation, respectively. The directions of the [001] and [1−10] of crystalline BT correspond to the directions of the [0−10] and [100] of crystalline CT, respectively. The mesocrystalline nanocomposites were formed via an in situ topochemical mesocrystal conversion mechanism. The density of the artificial BT/CT heteroepitaxial interface in these mesocrystalline nanocomposites can be adjusted by regulating the fraction of BT and CT in the nanocomposites. The mesocrystalline BT/CT nanocomposite with the composition close to BT/CT = 1/1 presents a large piezoelectric response owing to the lattice strain derived from its heteroepitaxial interfaces with the high density in the nanocomposite.

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Topological relations and piezoelectric responses of crystal-axis-oriented BaTiO₃/CaTiO₃ nanocomposites†

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Topological relations and piezoelectric responses of crystal-axis-oriented BaTiO₃/CaTiO₃ nanocomposites

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