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Lodestone-explanation for magnetic properties and characterization of the source of magnetic hardeningThe microstructure of Class I lodestones was investigated by X-ray diffraction and by optical and transmission electron microscopy, and the behavior of lodestone magnetization was studied at temperatures of 4 to 825 K. It was found that intense magnetization is associated with the gamma Fe2O3-Fe3O4 intergrowth. Thermal demagnetization of the lodestone studied was nearly complete at 300 C. The loss of natural remanence was found to be associated with transformation of gamma Fe2O3 to alpha Fe2O3.
Document ID
19790054423
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wasilewski, P. J. (NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1979
Subject Category
Solid-State Physics
Accession Number
79A38436
Distribution Limits
Public
Copyright
Other

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