Photoelectrochemical properties of lead-free ferroelectric ceramic Ba(Ti0.96Mg0.013Nb0.026)O3: application to solar conversion of eosin
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The lead-free Ba(Ti0.96Mg0.013Nb0.026)O3 composition has been prepared by solid state reaction. The room temperature X-ray diffraction revealed a perovskite phase with a tetragonal symmetry. The complex dielectric permittivity measured on cooling from 470 to 150 K in the frequency range (102–106 Hz) indicated a ferroelectric behavior and exhibited a large electromechanical response. This ferroelectric perovskite showed photoelectrochemical properties with an optical gap of 2.90 eV, n-type conduction and a flat band potential of −0.57 V SCE . As application, the oxide is successfully tested for the eosin oxidation under solar light. At pH ~ 6.3, 90 % of eosin (15 mg L−1) disappeared after 6 h of illumination for a catalyst dose of 2.5 g L−1.
KeywordsPerovskite BaTiO3 Ferroelectric Property Tetragonal Symmetry Complex Dielectric Permittivity
The authors are grateful to Dr. B. Bellal for his valuable assistance in optical measurements. This work was supported financially by the Faculty of Chemistry (USTHB, Algiers). The authors wish to express their sincere thanks to the Electronic Ceramics Department of Jozef Stefan Institute (Ljubjana, Slovenia) for the use of their facilities.
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