Abstract
57Fe Mössbauer spectroscopy data obtained between 4.2 and 298 K, TEM, and magnetic measurements were used to study details of the real structure of cobalt oxides, CoO and Co 3O 4. In Co 3O 4 samples synthesized at low temperatures the tracer is nonuniformly distributed. It exists in the form of α-Fe 2O 3 inclusions generating stacking faults as well as in the form of Fe 3+ ions in octahedral positions of the spinel matrix. An excess of oxygen in Co 3O 4 was found to generate cation vacancies in the octahedra. The two-phase CoO-Co 3O 4 system displays a dislocation network broadening the resonance lines and increasing the quadrupole splitting. For monophasic CoO an excess of oxygen leads to the formation of microclusters of Co 3O 4. A periodic array of shear type extended defects found in modified CoO was proposed to be generated by ordering of Fe impurities in some planes of the cubic structure.
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