Abstract
A stable iron(III)hydroxide sol was produced, spun as a gel fibre and collected as an aligned tow blanket. The alignment of the fibre was found to be 88.8% within ± 20° of the axis of alignment, comparable to that of some commercially developed ceramic fibres. Heating in air at a temperature of 250 °C for 1 hour yielded single phase haematite fibres, and these were characterised by X-ray diffraction and electron microscopy. Upon reduction of the gel fibre in 5% H2 in N2 at 350 °C for 1 hour, single phase magnetite was obtained and characterised by X-ray diffraction, infrared and Mössbauer spectroscopy. The morphology of the fibre was studied, and it was found that the transformation to magnetite was accomplished with no compromise of integrity of the fibre or its alignment, although there was an accompanying change in microstructure. The strain to break of the magnetite fibres was measured to be of a least 0.6%, and this compares well with some commercial fibres.
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References
C. Heck, “Magnetic Materials and their Applications” (Butterworth and Co. Ltd., London, 1974).
S. Krupicka and P. Novak, Ferromagnetic Materials, p. 263.
D. J. Craik and R. S. Tebble, “Ferromagnetism and Ferromagnetic Domains” (North-Holland Publishing Company, Amsterdam, 1965) pp. 93–96.
J. Smit and H. P. J. Wijn, “Ferrites” (Philips Technical Library, Eindhoven, 1959) p. 157.
J. P. Jakubovics, “Magnetism and Magnetic Materials” (The Institute of Metals, Cambridge, 1994) p. 107.
E. J. W. Verwey and P. W. Haaijman, Physica. 8 (1941) 979–87.
L. R. Bickford, J. M. Brownlow and R. F. Pendyer, Proc. IEE-B 104 (1957) 238–244.
A. E. Regazzoni, G. A. Urrutia, M. A. Blesa and A. J. G. Maroto, J. Inorg. Nucl. Chem. 43 (1981) 1489–1493.
R. M. Cornell and U. Schwertmann, “The Iron Oxides” (VCH, New York, 1996) p. 368.
M. J. Morton, J. D. Birchall and J. E. Cassidy, (ICI) UK Patent 1360200 (1974).
M. H. Stacey and M. D. Taylor, (ICI) Eur. Patent 318203 (1987).
R. A. Nyquist and R. O. Kagel, “Infrared Spectra of Inorganic Compounds” (Academic Press, London, 1971).
E. Murad and J. H. Johnston, “MössBauer Spectroscopy Applied to Inorganic Chemistry, ” Vol 2, edited by G. Long (Plenum Publishing Corp., New York, 1987) pp. 2507–2582.
M. P. Harmer, H. M. Chan and D. M. Smyth, Mater. Res. Soc. Symp. Proc. (Defect Prop. Process, High Technol. Nonmet. Mater.) (1986) 125–134.
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Pullar, R.C., Pyke, D.R., Taylor, M.D. et al. The manufacture and characterisation of single phase magnetite and haematite aligned fibres from an aqueous sol-gel process. Journal of Materials Science 33, 5229–5235 (1998). https://doi.org/10.1023/A:1004488005428
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DOI: https://doi.org/10.1023/A:1004488005428