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Croatica Chemica Acta, Vol. 88 No. 4, 2015.

Izvorni znanstveni članak

https://doi.org/10.5562/cca2743

Chromium Substituted Cobalt Ferrites by Glycine-Nitrates Process

Dana Gingasu ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Lucian Diamandescu orcid id orcid.org/0000-0001-7303-2298 ; National Institute of Materials Physics, 105-bis Atomistilor Street, P. O. Box MG-7, Bucharest-Magurele 077125, Romania
Ioana Mindru ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Gabriela Marinescu ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Daniela C. Culita ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Jose Maria Calderon-Moreno ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Silviu Preda ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
Cristina Bartha ; National Institute of Materials Physics, 105-bis Atomistilor Street, P. O. Box MG-7, Bucharest-Magurele 077125, Romania
Luminita Patron ; Ilie Murgulescu Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania

Puni tekst: engleski pdf 2.456 Kb

str. 445-451

preuzimanja: 1.281

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Sažetak

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.

Ključne riječi

glycine-nitrates process; spinel; Mössbauer spectroscopy; magnetic measurements

Hrčak ID:

154174

URI

https://hrcak.srce.hr/154174

Datum izdavanja:

31.12.2015.

Posjeta: 2.086 *