Topochemical transformation of two-dimensional single crystalline Na0.5Bi0.5TiO3–BaTiO3 platelets from Na0.5Bi4.5Ti4O15 precursors and their piezoelectricity
作者： Chao Jiang , Dou Zhang , Kechao Zhou , Haixue Yan , Hangfeng Zhang
DOI: 10.1039/C7TA01591G
关键词: Monoclinic crystal system 、 Perovskite (structure) 、 Materials science 、 Powder diffraction 、 Transmission electron microscopy 、 Tetragonal crystal system 、 Piezoresponse force microscopy 、 Crystallography 、 Poling 、 Lamellar structure
摘要: Two-dimensional monocrystalline platelets of the perovskite structured lead–free system (Na0.5Bi0.5)0.93Ba0.07TiO3 (NBBT) were synthesized from layer-structured Na0.5Bi4.5Ti4O15 (NBIT), using a topochemical route. Both NBIT and NBBT showed high aspect ratios with an average size 10 μm thickness 0.6 μm, for latter. A structural transformation to was identified in transitional platelet, which contained phases both NBBT. The composition lies at morphotropic phase boundary (MPB), coexistence monoclinic tetragonal polymorphs confirmed by X-ray powder diffraction analysis. Transmission electron microscopy piezoresponse force used investigate domain structure, stripe-like domains unpoled transformed into lamellar after poling. amplitude platelet indicated large strain, corresponding field-induced strain Smax/Emax around 800 pm V−1 5 kV mm−1, is significantly higher than that ceramic samples same applied potential.
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