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Precipitation and Coarsening of Magnesioferrite in Dilute Solutions of Iron in MgO
Author(s) -
WIRTZ G. P.,
FINE M. E.
Publication year - 1968
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.1151-2916.1968.tb11903.x
Subject(s) - precipitation , superparamagnetism , materials science , volume fraction , diffusion , mineralogy , chemical engineering , analytical chemistry (journal) , thermodynamics , chemistry , magnetization , magnetic field , composite material , chromatography , physics , quantum mechanics , meteorology , engineering
The precipitation and coarsening of magnesioferrite in MgO containing 1% Fe, prepared at 1440°C and aged at 700° and 800° C in air, were investigated by quantitative electron microscopy and magnetic analysis. The particles are superparamagnetic. The results of the two methods agree. The volume fraction of precipitate quickly reaches essentially its final value; then the particles grow according to the law of diffusion‐controlled coarsening. The precipitate becomes anisotropic at long aging times.