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Cation Distributions in Rapidly Solidified Cobalt Ferrite
Author(s) -
Guire Mark R.,
Kalonji Gretchen,
O'Handley Robert C.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06707.x
Subject(s) - cobalt , supercooling , ferrite (magnet) , mössbauer spectroscopy , materials science , cobalt ferrite , analytical chemistry (journal) , metallurgy , thermodynamics , chemistry , crystallography , composite material , physics , chromatography
The cation distributions in two rapidly solidified cobalt ferrites have been determined using Mössbauer spectroscopy at 4.2 K in an 8‐T magnetic field. The samples were obtained by gas atomization of a CoO–Fe 2 O 3 –P 2 O 5 melt. The degree of cation disorder in both cases was greater than is obtainable by cooling unmelted cobalt ferrite. The more rapidly cooled sample exhibited a smaller departure from the equilibrium cation distribution than did the more slowly cooled sample. This result is explained on the basis of two competing effects of rapid solidification: high cooling rate of the solid, and large undercooling.