1. Al3+ ions dependent structural and magnetic properties of Co-Ni nano-alloys.
- Author
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Kadam RH, Alone ST, Gaikwad AS, Birajdar AP, and Shirsath SE
- Subjects
- Alloys chemistry, Cations, Crystallization methods, Macromolecular Substances chemistry, Magnetic Fields, Materials Testing, Molecular Conformation, Particle Size, Surface Properties, Aluminum chemistry, Cobalt chemistry, Magnets, Metal Nanoparticles chemistry, Metal Nanoparticles ultrastructure, Nickel chemistry, Oxygen chemistry
- Abstract
Ferrite samples with a chemical formula Co0.5Ni0.5Al(x)Fe(2-x)O4 (where x = 0.0, 0.25, 0.5, 0.75 and 1.0) were synthesized by sol-gel auto-combustion method. The synthesized samples were annealed at 600 degrees C for 4 h. An analysis of X-ray diffraction (XRD) patterns reveals the formation of single phase cubic spinel structure. The lattice parameter decreased linearly with the increasing Al content x. Nano size of the powders were confirmed by the transmission electron micrographs (TEM). Particle size, bulk density decreased whereas specific surface area and porosity of the samples increased with the Al substitution. Cation distribution of constituent ions shows linear dependence of Al substitution. Based on the cation distribution obtained from XRD data, structural parameters such as lattice parameters, ionic radii of available sites and the oxygen parameter 'u' is calculated. Saturation magnetization (M(s)), magneton number (n(B)) and coercivity (H(c)) decreased with the Al substitution. Possible explanation for the observed structural and magnetic behavior with various Al content are discussed.
- Published
- 2014
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