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Nucleation and Growth of Magnesioferrite in MgO Containing 0.9% Fe 3+
Author(s) -
WOODS K. N.,
FINE M. E.
Publication year - 1969
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.1151-2916.1969.tb13362.x
Subject(s) - nucleation , precipitation , supersaturation , materials science , volume fraction , particle (ecology) , ion , analytical chemistry (journal) , mineralogy , chemistry , thermodynamics , physics , chromatography , composite material , oceanography , organic chemistry , meteorology , geology
The initial stage of precipitation of magnesioferrite from a supersaturated solid solution of 0.9 cation % Fe 3+ in MgO at 500 °C was studied by fitting the magnetization curves to 7000 Oe at low temperatures with the Brillouin function. The averase umber of Fe 3+ ions in a precipitate particle, increased monotonically with aging time from 9 in the as‐quenched condition to 88 after 16 h. The average spin quantum number per Fe 3+ ion decreased to near its final value at an aging time corresponding to = 50. Thus the volume fraction of precipitate is near the final value when the average particle size is only about three unit cells of magnesioferrite.