Widespread occurrence of a novel high coercivity, thermally stable, low unblocking temperature magnetic phase in heated archeological material

Details Widespread occurrence of a novel high coercivity, thermally stable, low unblocking temperature magnetic phase in heated archeological material Widespread occurrence of a novel high coercivity, thermally stable, low unblocking temperature magnetic phase in heated archeological material

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421302m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 21, CiteID L21302

Mathematics

Logic

5

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Archeomagnetism, Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Paleointensity

Scientific paper

The widespread occurrence of a novel, high coercivity magnetic phase in well-heated archeological material is reported. Its properties are defined when it represents the dominant magnetic phase, although it is nearly always found as part of a mixture of magnetic phases. They are as follows: very high coercivity (remanence coercivity >600 mT), low unblocking temperatures (<=200°C) and high degree of thermal stability-this last property distinguishing it from goethite. The phase shows striking similarities to magnetic phases produced by thermal decomposition of nontronite (an Fe-rich clay), where decomposition occurs after prolonged heating in air to high temperatures - conditions suffered by well-heated archeomagnetic material. Preliminary results of Mössbauer and X-Ray diffraction spectroscopy suggest that the phase is more likely to be a substituted hematite, rather than Fe-cristobalite or a variant of $\varepsilon$-Fe2O3.

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