Magnetic cristobalite (?) - A possible new magnetic phase produced by the thermal decomposition of nontronite

Details Magnetic cristobalite (?) - A possible new magnetic phase produced by the thermal decomposition of nontronite Magnetic cristobalite (?) - A possible new magnetic phase produced by the thermal decomposition of nontronite

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...225.1152m&link_type=abstract

Science (ISSN 0036-8075), vol. 225, Sept. 14, 1984, p. 1152-1154.

Computer Science

15

Clays, Magnetic Properties, Phase Transformations, Regolith, Thermal Decomposition, Antiferromagnetism, Coercivity, Heat Treatment, Magnetization, Mars Surface, Planetary Geology, X Ray Analysis

Scientific paper

The effect of heat treatment for 1 h or more at 900-1000 C on the magnetic properties of nontronite, an iron-rich smectite clay thought to be an important component of Martian regolith, is investigated experimentally, extending the findings of Moskowitz and Hargraves (1982). The results are presented in graphs and tables and discussed. A phase with Curie temperature 200-220 C, remanent coercivity greater than 800 mT, and a type-2 room-temperature-coercivity response to thermomagnetic cycling is observed and attributed to an iron-substituted cristobalite which may form by topotactic growth from a smectite precursor.

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