Gadolinium–Nickel ferrites prepared from metal citrates precursors

• Published in: Physica. B, Condensed matter Vol. 354; no. 1; pp. 241 - 245
• Main Authors: Sileo, Elsa E., Jacobo, Silvia E.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 31.12.2004; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Gadolinium; Magnetic properties; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Materials science; Materials synthesis; materials processing; Mössbauer effect; other γ-ray spectroscopy; Nickel ferrites; Physics; Substituted ferrites; Nickel ferrites; Gadolinium; Substituted ferrites; Magnetic properties; Ferrites; Combustion synthesis; Moessbauer effect; Inorganic compounds; Magnetic permeability; Transition element compounds; Chemical composition; Lattice parameters
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.10.002

The structure of a series of nickel ferrites obtained from mixed Gd, Fe and Ni citrates has been investigated in order to explore the possibility of Gd-for-Fe substitution in the solids. Five samples with nominal composition NiFe 2.00 - y Gd y O 4 , y = 0.00 , 0.04, 0.05, 0.10 and 0.12, were prepared by the auto-combustion method. For y ≠ 0 , a mixture of a substituted ferrite, GdFeO 3 , and variable quantities of NiO composes the obtained solids. Rietveld simulation and Mössbauer spectra confirm the Gd-for-Fe substitution in the spinel phase. Ferrite-cell parameter indicates that the maximum Gd-for-Fe substitution is accomplished at y = 0.05 . Electromagnetic measurements indicate an enhancement of the permeability for the Gd-inserted samples.