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Petrovský et al. 1996
Petrovský, E., Kropácek, V., Dekkers, M.J., deBoer, C., Hoffmann, V. and Ambatiello, A. (1996). Transformation of hematite to maghemite as observed by changes in magnetic parameters: Effects of mechanical activation?. Geophysical Research Letters 23: doi: 10.1029/96GL01411. issn: 0094-8276.

A natural hematite of hydrothermal origin shows evidence of time-dependent behavior related to the sample preparation procedure (involving significant crushing and milling). A strongly magnetic phase with a Curie temperature (~630 ¿C) corresponding to that of maghemite is present after storage for one-and-a-half-years, while being absent in the original sample material. The magnetic properties of the hematite-maghemite in relation to mechanical treatment are compared and possible mechanisms of the hematite transformation are discussed. The hematite-maghemite transformation is suggested to have resulted primarily from recrystallization induced by shear stress resulting from crushing and milling. ¿ American Geophysical Union 1996

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Abstract

Keywords
Geomagnetism and Paleomagnetism, Rock and mineral magnetism, Geomagnetism and Paleomagnetism, General or miscellaneous
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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