1. Chromium Substituted Cobalt Ferrites by Glycine-Nitrates Process
- Author
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Dana Gingasu, Lucian Diamandescu, Ioana Mindru, Gabriela Marinescu, Daniela C. Culita, Jose Maria Calderon-Moreno, Silviu Preda, Cristina Bartha, Luminita Patron, Dana Gingasu, Lucian Diamandescu, Ioana Mindru, Gabriela Marinescu, Daniela C. Culita, Jose Maria Calderon-Moreno, Silviu Preda, Cristina Bartha, and Luminita Patron
- Abstract
Chromium substituted cobalt ferrites (CoFe2–xCrxO4, 0 ≤ x ≤ 2) were synthesized through solution combustion method using glycine as fuel, named glycine-nitrates process (GNP). As evidenced by X-ray diffraction data (XRD), single cubic spinel phase was formed for all CoFe2–xCrxO4 (0 ≤ x ≤ 2) series. The cubic lattice parameter (a) decreases with increasing chromium content. Room temperature 57Fe Mössbauer spectra revealed the Fe3+ and Cr3+ site occupancy, the local hyperfine magnetic fields and the substitution of Fe3+ by Cr3+ in the lattice. Scanning electron microscopy (SEM) showed a refinement of particle size with the increase of Cr3+ content. Magnetic measurements from 5 K to 120 K have shown a dropping in the saturation magnetization as the chromium content increases. This behaviour has been explained in terms of substitution of Fe3+ by Cr3+ in the cubic lattice of cobalt ferrite.
- Published
- 2015