Preparation and characterisation of CaO-Bi2O3 complex oxide Online publication date: Fri, 07-Dec-2012
by Hiroyuki Nakamura; Takuya Uehara; Yuki Obukuro; Kenji Obata; Shigenori Matsushima; Masao Arai; Kenkichiro Kobayashi
International Journal of Nanotechnology (IJNT), Vol. 10, No. 1/2, 2013
Abstract: Ca4Bi6O13 powders prepared from a citric acid complex were characterised by X-ray diffraction, UV-vis diffuse reflectance spectra and specific surface area measurements. In a citric acid complex method, the single phase of Ca4Bi6O13 crystal was obtained at 700°C in air. The Ca4Bi6O13 powders calcined at 700°C for 12 h had a crystallite size of 68 nm and a specific surface area of 1.05 m²/g. The optical band gap of Ca4Bi6O13 was estimated to be 2.82 eV. The type of optical transition was direct and this result was consistent with the prediction by a first-principles energy band calculation. The Ca4Bi6O13 powders showed a distinct photocatalytic decomposition of methylene blue under visible light irradiation (a wavelength ≥ 420 nm). The visible light response photocatalysis may be ascribed to the small band gap energy, the direct optical transition, and a fairly wide dispersion of the top of the valence band.
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