Abstract
Mössbauer spectroscopy, x-ray powder diffraction, thermal analysis and elemental analysis were used for the study of the mechanism of reaction between NaCI and Fe2(SO4)3 in the oxidizing atmosphere (air). It was found that the reaction starts at 400°C in isothermal conditions and is accompanied by the liberation of Cl2. The initial reaction proceeds in the molar ratio of NaCl:Fe2(SO4)3=3:1. β-Fe2O3, NaFe(SO4)2, Na3Fe(SO4)3 and Na2SO4 were identified as solid products of the initial reaction. At the second stage both the double sulfates were transformed into β-Fe2O3 and Na2SO4, the gaseous SO3 was liberated simultaneously. Thermally less stable NaFe(SO4)2 decomposes before Na3Fe(SO4)3. The hexagonal α-Fe2O3 is formed in this process only as the product of the structural transformation of β-Fe2O3. This beta-alpha transformation accompanies both the initial reaction and the secondary conversions of the intermediates. The Mössbauer parameters of the reaction products are enlisted.
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References
Ben-Dor, L., Fischbein, E., Feiner, I. and Kalman, Z. (1977) β Fe2O3: Preparation of thin films by chemical vapor deposition from organometalic chelates and their characterization, J Electrochem. Soc. 124, 451–457.
Muruyama, T. and Kanagawa, T. (1996) Electrochromic properties of iron oxide thin films prepared by chemical vapor deposition, J. Electrochem. Soc. 143, 1675–1677.
Gonzales-Carreno, T., Morales, M.P. and Serna, C.I. (1994) Fine beta Fe2O3 particles with cubic structure obtained by spray pyrolysis, J. Maier. Sci. Lett. 13, 381–382.
Ikeda, Y., Takano, M. and Bando, Y. (1986) Formation mechanism of needle-like a-Fe2O3 particles grown along the c axis and characterization of precursorily formed β-Fe2O3, Bull. Inst. Chem. Res., Kyoto Univ. 64, 249–258.
Bauminger, E.R., Ben-Dor, L., Feiner, I., Fischbein, E., Nowik, I. and Ofer, S. (1977) Mössbauer effect studies of β-Fe2O3, Physica 86–88B, 910–912.
Ben-Dor, L. and Fischbein, E. (1976) Concerning the β phase of iron (III) oxide, Acta Cryst. B 32, 667.
Wiarda, D., Wenzel, T., Uhrmacher, M. and Lieb, K.P. (1992) Hyperfine interaction of 111Cd impurities in Mn203, Mn304 and ß- Fe2O3, J. Phys. Chem. Solids 53, 1199–1209.
Wiarda, D. and Weyer, G. (1993) Mössbauer investigations of the antiferromagnetic phase in the metastable-Fe2O3,β Int. J Mod. Phys. B 7, 353–356.
Powder Diffraction File 1997, International Center for Diffraction Data, Pennsylvania, U.S.A.
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© 1999 Springer Science+Business Media Dordrecht
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Zboril, R., Mashlan, M., Krausova, D. (1999). The Mechanism of β-Fe2O3 Formation by Solid-State Reaction between NaCl and Fe2(SO4)3 . In: Miglierini, M., Petridis, D. (eds) Mössbauer Spectroscopy in Materials Science. NATO Science Series, vol 66. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4548-0_5
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DOI: https://doi.org/10.1007/978-94-011-4548-0_5
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