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- W2055909832 abstract "Trivalent iron (0.21–1.21 mol% equivalent Fe2O3) was introduced into silica gel monoliths prepared via sols obtained from tetraethyl orthosilicate and metal salts at different final sol pH values. The UV-visible spectra indicated a change from an octahedral to tetrahedral Fe3+ environment as the pH increased. An electron paramagnetic resonance spectral resonance at g = 4.22 appeared, in addition to that at g = 2.0, as the final pH increased. The resonance at g = 4.22 was also observed for some gels upon heat treatment. Colloidal precipitation of Fe2O3 was noted with increase in cation concentration and temperature of heat treatment. The effects of processing on light transmission of gels were measured. The results indicated several processing conditions leading to total cut-off of ultraviolet light through the doped gel monoliths." @default.
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- W2055909832 date "1996-02-01" @default.
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- W2055909832 title "Spectroscopic properties of low Fe3+-doped silica gels" @default.
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- W2055909832 doi "https://doi.org/10.1016/0022-3093(95)00525-0" @default.
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