Abstract
A detailed infrared spectroscopy analysis in the 2500 to 3800 cm−1 region has been used to study the formation of species in samples of iron oxides embedded in silica xerogel matrix. We report the presence of α, β, and γ forms of iron oxyhydroxides as intermediate species in the formation of α-Fe2O3, γ-Fe2O3 and ε-Fe2O3 starting from three different iron precursors: iron nitrate, iron chloride and nanometric Fe particles prepared by chemical reduction. Our results show that under thermal dehydration α and γ forms of iron oxyhydroxides transform into hematite and maghemite, respectively, whereas the β form transform to the ε-Fe2O3 without going through an intermediate iron oxide phase.
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References
R.D. McMichael, R.D. Shull, L.J. Swartzendruber, L.H. Bennett, and R.E. Watson, J. Magn. Magn. Mater. 111, 29 (1992).
C. Cannas, D. Gatteschi, A. Musinu, G. Piccaluga, and C. Sangregorio, J. Phys. Chem. B 102, 7721 (1998).
F. del Monte, M.P. Morales, D. Levy, A. Fernández, M. Ocaña, A. Roige, E. Molins, K. O'Grady, and, C.J. Cerna, Langmuir 13, 3627 (1997).
D. Niznansky, N. Viart, and J.L. Rehspringer, J. Sol-Gel Sci & Tech. 8, 615 (1997).
E.J.A. Pope and J. Mackenzie, J. Non-Cryst. Solids 87, 185 (1986).
C.J. Brinker and G.W. Scherer, Sol Gel Science (Academic Press, San Diego, 1990).
R. Cornell and U. Schwertmann, The Iron Oxides (VCH, Weinheim, 1996).
D.L. Leslie-Pelecky and R.D. Rieke, Chem. Mater. 8, 1770 (1996).
J. Yan, A.M. Buckley, and M. Greenblatt, J. Non-Cryst. Solids 180, 180 (1995).
S. Ponce-Castañeda, J.R. Martínez, S.A. Palomares-Sánchez, F. Ruiz, and O. Domínguez, J. Sol-Gel Sci & Tech. 25, 29 (2002).
T. Ishikawa, W.Y. Cai, and K. Kandori, J. Chem. Soc., Faraday Trans. 88, 1173 (1992).
Y. Ryskin, in The Infrared Spectra of Minerals, edited by V.C. Farmer (Mineralogical Society, London, 1974) pp. 137, 181.
R. Morris, H. Lauer, Ch. Lawson, E. Gibson, G. Nace, and Ch. Stewart, J. Geophys. Res. 90, 3126 (1985).
S. Ramesh, I. Felner, Y. Koltypin, and A. Gedanken, J. Mater. Res. 15, 944 (2000).
S. Ponce-Castañeda, J.R. Martínez, F. Ruiz, S.A. Palomares-Sánchez, and J.A. Matutes-Aquino, J. Magn. Magn. Mater. 250, 160 (2002).
C. M. Parler, J.A. Ritter, and M.D. Amiridis, J. Non-Cryst. Solids 279, 119 (2001).
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Ponce-Castañeda, S., Martínez, J., Palomares-Sánchez, S. et al. Infrared Spectroscopy Analysis of Oxyhydroxides as Intermediate Species in the Formation of Iron Oxides-Silica Xerogels. Journal of Sol-Gel Science and Technology 27, 247–254 (2003). https://doi.org/10.1023/A:1024009916120
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DOI: https://doi.org/10.1023/A:1024009916120