Polycrystalline sample Ba(Ti0.9Sc0.05Nb0.05)O3 (BTSN) has been synthesized by solid-state reaction. The effects on the symmetry and dielectric properties of simultaneous cationic substitution of scandium and niobium in the titanium site of BaTiO3 were investigated. The room-temperature X-ray diffraction revealed a cubic perovskite phase after sintering at 1350 °C. The dielectric properties in the ranges (80–445 K) and (102–106 Hz) were studied. A broad dielectric band anomaly coupled with the shift of dielectric maxima toward higher temperatures with increasing frequency indicates a diffuse phase transition with a relaxor behavior. The parameters of the diffuse phase transition were evaluated from the linear plot of the modified Curie–Weiss law and a good fit to the Vogel–Fülcher relation corroborates the relaxor nature. The relaxor ferroelectric is characterized by a spontaneous polarization which should promote the separation of electron/hole (e−/h+) pairs and favors the photocatalytic properties in the nanodomains. The electrochemical impedance spectroscopy, measured over the region (1 mH–105 Hz) at pH ~ 7, shows the predominance of the bulk contribution. This BTSN ferroelectric ceramic possesses attractive photoelectrochemical properties with an optical gap of 2.54 eV and a flat band potential of 0.45 V SCE . As application, the oxide was successfully tested for the photooxydation under solar light of amoxicillin (AMX), a currently used antibiotic. Indeed, the energy band diagram indicates an electron transfer from the conduction band to dissolved oxygen, forming O2 · radicals, responsible of the AMX degradation. The AMX concentration was followed by high performance liquid chromatography. A conversion of 92% is recorded in AMX solution (50 mg L−1) within 4 h under solar light and the kinetic obeys to a first order model with a rate constant of 7.73 × 10−3 min−1.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: Dec 26, 2017
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