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Spinodal Decomposition in the System CoFe 2 O 4 ‐Co 3 O 4
Author(s) -
TAKAHASHI M.,
GUIMARÃES J. R. C.,
FINE M. E.
Publication year - 1971
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.1151-2916.1971.tb12293.x
Subject(s) - spinodal decomposition , nucleation , transmission electron microscopy , spinel , decomposition , diffraction , materials science , electron diffraction , crystallography , miscibility , phase (matter) , analytical chemistry (journal) , chemistry , nanotechnology , optics , polymer , metallurgy , physics , organic chemistry , chromatography , composite material
A miscibility gap exists in the spinel‐structured region of the pseudobinary CoFe 2 O 4 ‐CO 3 O 4 system in air. Phase decomposition inside the miscibility gap was investigated by transmission electron microscopy and by X‐ray diffraction. In samples containing 35 and 50 cation % Fe, the first observable changes on aging at 500°C were appearance of side bands on X‐ray diffraction photographs of powder samples and of a periodic structure under the electron microscope. When specimens which contained 50 cation % Fe were aged at 700°C, the first observed change was another set of diffraction lines; homogeneously distributed fine particles were also observed. The former behavior was attributed to spinodal decomposition and the latter to classical nucleation and growth.