Computer Science
Scientific paper
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.
Hargraves Robert B.
Moskowitz Bruce M.
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