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Gas atomization of cobalt ferrite-phosphate meltsXRD, Moessbauer spectroscopy, and EDXS have been used to characterize a rapidly-solidified (Co,Fe)3O4 spinel generated in a cobalt-iron-phosphate glass matrix by gas atomization of melts. Of the two compositions tested, that containing 20 mol pct P2O5 exhibited randomly-oriented ferrite crystallization whose growth appears to have been diffusion-controlled. Unlike the ferrite, in which the iron has both tetrahedral and octahedral coordination, the iron in the glassy matrix was primarily of distorted-octahedral coordination. Calculations indicate that the cooling rates obtained with oxide melts vary strongly with droplet size, but less strongly with melt temperature.
Document ID
19890044116
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
De Guire, Mark R.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
O'Handley, R. C.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Kalonji, G.
(MIT Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1989
Publication Information
Publication: Journal of Materials Science
Volume: 24
ISSN: 0022-2461
Subject Category
Inorganic And Physical Chemistry
Accession Number
89A31487
Funding Number(s)
CONTRACT_GRANT: DE-FG02-84ER-451
CONTRACT_GRANT: NSG-7604
Distribution Limits
Public
Copyright
Other

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