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Topochemical transformation of two-dimensional single crystalline Na0.5Bi0.5TiO3–BaTiO3 platelets from Na0.5Bi4.5Ti4O15 precursors and their piezoelectricity

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Abstract

Two-dimensional monocrystalline platelets of the perovskite structured lead–free system (Na0.5Bi0.5)0.93Ba0.07TiO3 (NBBT) were synthesized from platelets of layer-structured Na0.5Bi4.5Ti4O15 (NBIT), using a topochemical route. Both NBIT and NBBT platelets showed high aspect ratios with an average size of 10 μm and thickness of 0.6 μm, for the latter. A structural transformation from layer-structured NBIT to perovskite NBBT was identified in a transitional platelet, which contained phases of both NBIT and NBBT. The composition of NBBT lies at a morphotropic phase boundary (MPB), with the coexistence of monoclinic and tetragonal polymorphs confirmed by X-ray powder diffraction analysis. Transmission electron microscopy and piezoresponse force microscopy were used to investigate the domain structure, with stripe-like domains in the unpoled system transformed into lamellar domains after poling. The piezoresponse amplitude for a NBBT platelet indicated a large piezoresponse strain, corresponding to a field-induced strain Smax/Emax of around 800 pm V−1 at 5 kV mm−1, which is significantly higher than that in ceramic samples of NBBT at the same applied potential.

Graphical abstract: Topochemical transformation of two-dimensional single crystalline Na0.5Bi0.5TiO3–BaTiO3 platelets from Na0.5Bi4.5Ti4O15 precursors and their piezoelectricity

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Publication details

The article was received on 21 Feb 2017, accepted on 12 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA01591G
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Topochemical transformation of two-dimensional single crystalline Na0.5Bi0.5TiO3–BaTiO3 platelets from Na0.5Bi4.5Ti4O15 precursors and their piezoelectricity

    C. Jiang, D. Zhang, K. Zhou, H. Yan, H. Zhang and I. Abrahams, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA01591G

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