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- W2077880095 abstract "Modified hydrothermal and ‘wet’ precipitation routes at room temperature were employed to synthesise pure monoclinic BiVO 4 powders of varying particle morphologies. Monoclinic BiVO 4 powder was also prepared by a solid-state reaction at 700°C. Depending on the synthesis conditions, the colour of BiVO 4 varies from inhomogeneously yellow–brown to homogeneously and intensive lemon yellow. BiVO 4 prepared by solid-state reaction consisted of large compact particles about 15 μm in size and of irregular shape. At higher magnification, the formation of domains with smooth terrace-like surfaces was observed. These domains ended with well-defined walls, and the edges of these walls were relatively very sharp. BiVO 4 synthesised by the hydrothermal and an aqueous process at RT consisted of smaller particles (0.3–1.2 μm) and of much bigger regular crystals with a well-defined crystal habit. A continuous shift of the most intense Raman band to lower wavenumbers reveals that the average short range symmetry of the VO 4 tetrahedra becomes more regular. The values of FWHM for the same Raman band increase from sample prepared by solid-state reaction to sample obtained at RT. The Raman results suggested that a sample prepared at high temperature consisted of less symmetric VO 4 tetrahedra than samples prepared at low temperature and that the high-temperature sample showed better crystallinity with less defects than the samples prepared by an aqueous process under mild conditions. FT-IR spectra showed main features typical of the vanadates of other metal(3+) cations. However, the position of IR bands recorded for BiVO 4 depended on the synthesis route." @default.
- W2077880095 created "2016-06-24" @default.
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- W2077880095 date "2005-06-01" @default.
- W2077880095 modified "2023-10-13" @default.
- W2077880095 title "Synthesis and characterisation of bismuth(III) vanadate" @default.
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- W2077880095 doi "https://doi.org/10.1016/j.molstruc.2004.10.075" @default.
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