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Electron-optical and electron-diffraction study of a disordered structural state in the transformation goethite-hematite (Plate XX)

Published online by Cambridge University Press:  14 March 2018

J. D. C. McConnell  and
J. Lima-de-Faria
J. D. C. McConnell
Affiliation:
Dept. of Mineralogy and Petrology, Downing PlaceCambridge
J. Lima-de-Faria
Affiliation:
Dept. of Mineralogy and Petrology, Downing PlaceCambridge
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Summary

Previous X-ray observations by J. Lima-de-Faria and P. Gay on the transformation goethite-hematite indicate that in the process of state change at low temperatures, maxima of scattered X-ray intensity occur as satellites to strong and diffuse Bragg maxima due to hematite. These maxima define a repeat distance of about 32 Å. Corresponding satellite maxima have been observed using electron diffraction technique and satellite maxima flanking the direct beam (000) have been used to obtain a direct electron optical image of the disordered state at high magnification. Such photographs show a mainly regular fringe system with spacing of approximately 30 Å. Dislocation patterns were also observed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 254 , September 1961 , pp. 898 - 901
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1961

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References

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