Facile preparation of uniform barium titanate (BaTiO3) multipods with high permittivity: impedance and temperature dependent dielectric behavior
作者： Suryakanta Nayak , Banalata Sahoo , Tapan Kumar Chaki , Dipak Khastgir
DOI: 10.1039/C3RA44815K
关键词: Materials science 、 X-ray photoelectron spectroscopy 、 Barium titanate 、 Dielectric loss 、 Permittivity 、 Analytical chemistry 、 Scanning probe microscopy 、 Perovskite (structure) 、 High-resolution transmission electron microscopy 、 Dielectric
摘要: Perovskite barium titanate (BaTiO3) multipods were prepared via high temperature solid state reaction. The crystal structure and morphology of BaTiO3 particles characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), resolution transmission (HRTEM), probe (SPM). XRD analysis the revealed that a single-phase compound was formed having tetragonal structure. Calorimetric study (DSC) over room to used find energy involved in different steps synthesis especially during initiation termination process for formation BaTiO3. These have average aspect ratio (∼10, where diameter ∼300 nm length ∼3 μm) as seen from FESEM. UV-Vis spectroscopy reveals material is UV active. bulk surface chemical composition these investigated Fourier transform infrared (FTIR) photoelectron (XPS) spectra BaTiO3, titanium ions exist two oxidation states, namely Ti3+ Ti4+. multipod exhibits permittivity with relatively low dielectric loss. From impedance material, dual resistivity characteristics, one grain other grain-boundary can be distinguished. An equivalent circuit has been proposed through complex plot (Nyquist plot) multipods. This perfect capacitative nature Bode plot, charge storage devices electronic applications. dependent analysis, Curie found ∼85 °C.
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