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Ferroelectric Mesocrystalline BaTiO3/SrTiO3Nanocomposites with Enhanced Dielectric and PiezoelectricResponses.

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Bibliographic Details
Title:	Ferroelectric Mesocrystalline BaTiO3/SrTiO3Nanocomposites with Enhanced Dielectric and PiezoelectricResponses.
Authors:	Dengwei Hu¹, Hao Ma¹, Yasuhiro Tanaka¹, Lifang Zhao¹, Qi Feng¹
Source:	Chemistry of Materials. Jul2015, Vol. 27 Issue 14, p4983-4994. 12p.
Subjects:	Ferroelectricity, Nanocomposite materials, Barium titanate, Dielectrics, Piezoelectricity, Chemical processes
Abstract:	A platelike mesocrystallineBaTiO3/SrTiO3(BT/ST) nanocomposite is preparedvia a clever two-step solvothermal soft chemical process. First aprotonated titanate H1.07Ti1.73O4·nH2O (HT) crystal with a layeredstructure and platelike morphology is solvothermally treated in aBa(OH)2solution to generate a homogeneous platelike BaTiO3/HT (BT/HT) nanocomposite. Second the generated BT/HT nanocompositeis solvothermally treated in a Sr(OH)2solution to generatethe mesocrystalline BT/ST nanocomposite with platelike particle morphology.The transformation reactions from the HT precursor to the mesocrystallineBT/ST nanocomposite are topochemical conversion reactions, and theformed BT/ST nanocomposite is constructed from well-aligned BT andST nanocrystals in the same crystal-axis orientation. The BT/ST nanocompositeannealed at 900 °C shows a ferroelectric behavior and drasticallyenhanced piezoelectric and dielectric responses owing to the introductionof a lattice strain at a three-dimensional heteroepitaxial interfacebetween the BT and ST nanocrystals in the mesocrystal. The nanostructureof the BT/ST mesocrystal is suitable for simultaneous applicationof the strain engineering and the orientation engineering to develophigh performance piezoelectric and dielectric materials. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	A platelike mesocrystallineBaTiO3/SrTiO3(BT/ST) nanocomposite is preparedvia a clever two-step solvothermal soft chemical process. First aprotonated titanate H1.07Ti1.73O4·nH2O (HT) crystal with a layeredstructure and platelike morphology is solvothermally treated in aBa(OH)2solution to generate a homogeneous platelike BaTiO3/HT (BT/HT) nanocomposite. Second the generated BT/HT nanocompositeis solvothermally treated in a Sr(OH)2solution to generatethe mesocrystalline BT/ST nanocomposite with platelike particle morphology.The transformation reactions from the HT precursor to the mesocrystallineBT/ST nanocomposite are topochemical conversion reactions, and theformed BT/ST nanocomposite is constructed from well-aligned BT andST nanocrystals in the same crystal-axis orientation. The BT/ST nanocompositeannealed at 900 °C shows a ferroelectric behavior and drasticallyenhanced piezoelectric and dielectric responses owing to the introductionof a lattice strain at a three-dimensional heteroepitaxial interfacebetween the BT and ST nanocrystals in the mesocrystal. The nanostructureof the BT/ST mesocrystal is suitable for simultaneous applicationof the strain engineering and the orientation engineering to develophigh performance piezoelectric and dielectric materials. [ABSTRACT FROM AUTHOR]
ISSN:	08974756
DOI:	10.1021/acs.chemmater.5b01368