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Magnetic cristobalite (?) - A possible new magnetic phase produced by the thermal decomposition of nontroniteThe 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.
Document ID
19840064049
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Moskowitz, B. M.
(Princeton Univ. NJ, United States)
Hargraves, R. B.
(Princeton University Princeton, NJ, United States)
Date Acquired
August 12, 2013
Publication Date
September 14, 1984
Publication Information
Publication: Science
Volume: 225
ISSN: 0036-8075
Subject Category
Geophysics
Accession Number
84A46836
Funding Number(s)
CONTRACT_GRANT: NAGW-372
Distribution Limits
Public
Copyright
Other

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