Néel temperatures of synthetic substituted goethites and their rapid determination using low-field susceptibility curves

Details Néel temperatures of synthetic substituted goethites and their rapid determination using low-field susceptibility curves Néel temperatures of synthetic substituted goethites and their rapid determination using low-field susceptibility curves

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2125m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 14, p. 2125-2128

Physics

6

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Mineral Physics: Instruments And Techniques, Physical Properties Of Rocks: Thermal Properties, Mineralogy And Petrology: Crystal Chemistry

Scientific paper

The Néel temperatures (TN) of synthetic goethites (α-FeOOH), substituted with diamagnetic elements (Al, Ga) have been determined from the temperature dependence of their low-field susceptibility using a Kappabrige AC bridge. These temperatures proved to be identical to those derived from more conventional measurements of high-field or remanent magnetization versus temperature, and in good agreement with those inferred from Mössbauer models. The low-field susceptibility based-technique appears to offer a precise and rapid method of determining TN. While Néel temperature coincides with maximum unblocking temperature in Gagoethites, supporting the assumption that antiferromagnetism and parasitic ferromagnetism have a similar origin in goethite, the lack of clear correlation between saturation remanent magnetization and increasing diamagnetic substitution suggests that the weak ferromagnetism of goethite is due to substitution independent defects induced during crystal growth.

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