Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.489l&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 489
Computer Science
Magnetic Properties, Magnetization, Metals, Meteoritic Composition, Phase Transformations, Demagnetization, Iron Compounds, Nickel Compounds, Silicates
Scientific paper
The observed multiple fall of the Lowicz mesosiderite (in 1935) made its sample an important object of study. Distinct from pallasites, usually related to irons, mesosiderites are believed to be close to achondrites with basaltic or pyroxene-plagioclase silicate phases. However, the interrelation between the metal phase and the silicate one remains unexplained in a number of details. Having in mind a planned deeper insight into the magnetic properties of the metal phase we started from an initial limited study of the respective demagnetization curve, applying for reference a sample of the Derrick Peak Antarctica IIB iron DRP 78007.92. In order to measure it, the metal from Lowicz was mechanically recovered by crushing the silicate matrix to give some small platelets. The samples were demagnetized with an alterating field using a Superconducting Quantum Interference Device (SQUID) cryomagnetometer, situated inside an adequate 'magnetic vacuum. The obtained results are presented. The natural remanent magnetization for Lowicz was found to be of 24.85 A/m, while for DRP 78007.92 5.966 x 103 A/m, making the ratio of the ladder to the former one equal to 240. The similarity of the obtained demagnetization curves is observed, suggesting for Lowicz a rather sharp transition from a hard magnetization component to a soft one at 250 Oe for intensity decreased by 80%. The small irregularities on the curve for Lowicz are in contrast to a smooth slope and transition to a softer component observed at 150 Oe for the Derrick Peak iron. The similarity can be attributed to that of the Ni content in the Ni-Fe phase: 8.51% Ni for Lowicz, and 7.3% Ni for Derrick Peak iron. With more magnetic data available, especially thermomagnetic data, more advanced conclusions would be possible.
Krol Elizabeth
Lang Benjamin
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