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Ferrimagnetic Resonance Study of the Growth Rate of Super‐paramagnetic Precipitates of Magnesioferrite in MgO
Author(s) -
BIASI R. S.,
DEVEZAS T. C.
Publication year - 1976
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.1151-2916.1976.tb09388.x
Subject(s) - superparamagnetism , anisotropy energy , materials science , ferrimagnetism , activation energy , paramagnetism , diffusion , anisotropy , precipitation , condensed matter physics , nuclear magnetic resonance , analytical chemistry (journal) , magnetic anisotropy , chemistry , magnetic field , magnetization , thermodynamics , optics , physics , chromatography , quantum mechanics , meteorology
Superparamagnetic magnesioferrite particles were precipitated from single‐crystal MgO containing °2.2 cation% Fe, by aging between 700° and 1000°C. The anisotropy field of the precipitates was measured as a function of aging time and aging temperature. Superparamagnetic analysis was used to calculate the precipitate growth rate for several aging temperatures. It was found that from the earliest times studied, the particles grow according to the law of diffusion‐controlled coarsening. An activation energy of 72.5 kcal/mol was calculated for this growth process.