Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 818, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152869
Keywords
Mesocrystals; Nanocomposites; Lattice strain; Lattice mismatch; Piezoelectric materials
Categories
Funding
- Murata Science Foundation
- Scientific Research Project of Shaanxi Province Office of Education [2018JQ5182]
- Young Talent Support Program of Shaanxi Province University [20170708]
- Baoji science and technology planning project [2018JH-06]
- Science and Technology Foundation of Baoji University of Arts and Science [ZK16030]
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Ferroelectric mesocrystalline nanocomposite is a promising nanomaterial for enlarged piezoelectric response and dielectric response obtained using lattice strain engineering. In this study, mesocrystalline BaTiO3/Bi0.5K0.5TiO3 (BT/BKT) nanocomposites were prepared via a two-step topochemical process. In the first step, a platelike layered titanate H1.07Ti1.73O4 center dot nH(2)O (abbreviated as HTO) precursor was solvothermally treated in a Ba(OH)(2) solution to synthesize a BaTiO3/HTO (abbreviated as BT/HTO) nanocomposite. In the second step, a BT/HTO-Bi2O3-K2CO3 mixture was heat-treated to obtain BT/BKT nanocomposite. The reactions occurring in the formation of BT/BKT nanocomposite are topochemical reactions. Nanostructural analysis shows that the BT/BKT nanocomposite is constructed from well-aligned [110]-oriented BT nanocrystals and [001]-oriented BKT nanocrystals. In the nanocomposite BT(001)/BKT(100), heteroepitaxial interface is formed, introducing a lattice strain at the interface owing to their lattice mismatch. The BT/BKT nanocomposite exhibits much larger d(33)* and epsilon(r) values than those of individual BT and BKT mesocrystals. The enlarged piezoelectric and dielectric responses show the potential application of lattice strain engineering to mesocrystalline nanocomposites for high-performance lead-free piezoelectric materials. (C) 2019 Elsevier B.V. All rights reserved.
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