Hostname: page-component-7bb8b95d7b-s9k8s Total loading time: 0 Render date: 2024-09-13T12:43:25.112Z Has data issue: false hasContentIssue false
  • English
  • Français

Controlled Recrystallization of Hematite from Two Highly Different Phases of Ferric Trihydroxide

Published online by Cambridge University Press:  28 February 2011

Georges Denes ,
P. Kabro  and
M.C. Madamba
Georges Denes
Affiliation:
Concordia University, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, 1455 De Maisonneuve Blvd. W., Montreal, Quebec, H3G 1M8, Canada
P. Kabro
Affiliation:
Concordia University, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, 1455 De Maisonneuve Blvd. W., Montreal, Quebec, H3G 1M8, Canada
M.C. Madamba
Affiliation:
Concordia University, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, 1455 De Maisonneuve Blvd. W., Montreal, Quebec, H3G 1M8, Canada
Get access

Abstract

Hematite Fe2O3, is a semiconductor, and its electrical properties are highly sensitive to the preparation methods and purity. Its precursors can be hydrated ferric oxides; however, these are usually obtained from poorly defined ferric gels, which are obtained by hydrolysis of an aqueous solution of a ferric salt by a base. We have designed a novel synthetic route to ferric hydroxide, by reaction of a peroxo-compound with an aqueous solution of a ferrous salt, which involves simultaneous oxidation of Fe(ll) to Fe(lll), and hydrolysis, in the same reaction process. The two kinds of ferric hydroxide are highly different, however, both give hematite by dehydration/recrystallization, however, the way this occurs for each is different.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 307
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Wyckoff, R.W.G., Crystal Structures, 2nd ed. (Interscience Publishers, New York, 1964), pp. 6–8.Google Scholar
2 Gardner, R.F.G., Sweett, F. and Tanner, D.W., J. Phys. Chem. Solids 24, 1175 (1963); 24, 1183 (1963).Google Scholar
3 De Wit, J.H.W., Broersma, A.F. and Stroband, M., J. Solid State Chem. 37, 242 (1981).Google Scholar
4 Thackeray, M.M. and Coetzer, J., Mat. Res. Bull. 16, 591 (1981); S.J. Tjong, ibid., 18, 421 (1983); A.S.N. Murthy and K.S. Reddy, ibid., 19, 241 (1984).Google Scholar
5 Warnes, B.M., Aplan, F.F. and Simkovich, G., Solid State Ionics 12, 271 (1984).Google Scholar
6 Endo, S. and Ito, K., Solid State Comm. 36, 189 (1980).Google Scholar
7 Benjelloun, D., Bonnet, J.P., Dourmec, J.P., Launay, J.C., Onillon, M. and Hagenmuller, P., Mat. Chem. Phys. 10, 503 (1984).Google Scholar
8 Richard, M.A., Soled, S.L., Fiato, R.A. and DeRites, R.A., Mat. Res. Bull. 18, 829 (1983).Google Scholar
9 Hong, F., Yang, B.L., Schwartz, L.H. and Kung, H.H., J. Phys. Chem. 88, 2525 (1984); B.L. Yang, F. Hong and H.H. Kung, ibid., 88, 2531 (1984).Google Scholar
10 van der Giessen, A.A., Philips res. Rep. 12, 1 (1968).Google Scholar
11 Au-Yeung, S.C.F., Denes, G., Greedan, J.E., Eaton, D.R. and Birchall, T., Inorg. Chem. 23,1513(1984).Google Scholar
12 Au-Yeung, S.C.F., Eaton, D.R., Birchall, T., Denes, G., Greedan, J.E., Hallett, C. and Ruebenbauer, K., Can. J. Chem. 63, 3378 (1985).Google Scholar
13 Denes, G., in Production and Processing of Fine Particles, edited by Plumpton, A.J. (Pergamon Press, New York, 1988), pp. 615–626.Google Scholar
14 Warren, B.E., X-ray Diffraction. 2nd ed. (Dover Publications, New York, 1990), pp. 251–254.Google Scholar
15 Cullity, B.D., Elements of X-ray Diffraction. 2dn ed. (Addison-Wesley, Don Mills, Ontario, 1978), pp. 192, 284.Google Scholar