Produção Nacional
Revisado por pares
Spinodal Decomposition in the System CoFe 2 O 4 ‐Co 3 O 4
1971; Wiley; Volume: 54; Issue: 6 Linguagem: Inglês
10.1111/j.1151-2916.1971.tb12293.x
ISSN1551-2916
AutoresM. Takahashi, J.R.C. Guimarães, M. E. Fine,
Tópico(s)nanoparticles nucleation surface interactions
ResumoA 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.
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