Temperature induced evolution of structure/microstructure parameters and their correlations with electric/magnetic properties of nanocrystalline Nickel ferrite

Nickel ferrite nanoparticles were annealed in order to find dependence of electric/magnetic properties on crystallite size. The following correlations of crystallite size with physical parameters were found: (a) lattice parameter decreases with the increase in size and it reaches value for bulk coun...

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Bibliographic Details
Published in:Ceramics international 2014-04, Vol.40 (3), p.4521-4527
Main Authors: Vucinic-Vasic, Milica, Boskovic, Marko, Antic, Aleksandar, Stojanovic, Goran, Radovanovic, Milan, Fabian, Martin, Jovalekic, Cedomir, Pavlovic, Miodrag B., Antic, Bratislav
Format: Article
Language:English
Subjects:
Annealing
B. Grain size
C. Electrical properties
C. Magnetic properties
Cations
Crystallites
D. Ferrite
Deviation
Electrical resistivity
Magnetic properties
Nanoparticles
Nickel ferrites
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Summary:Nickel ferrite nanoparticles were annealed in order to find dependence of electric/magnetic properties on crystallite size. The following correlations of crystallite size with physical parameters were found: (a) lattice parameter decreases with the increase in size and it reaches value for bulk counterpart approximately for crystallites bigger than 7nm, (b) ac electrical resistivity at room temperature increases with the increase in crystallite size, (c) for crystallites of ~7nm or smaller electrical resistivity have maximum value at 50°C, (d) the real part of permittivity at selected frequency generally decreases with the increase in crystallite size and (e) magnetization increases with the increase in crystallite size. Deviation of stoichiometry, cation polyvalence, and cation redistribution with annealing are the main factors that influence physical properties of Nickel ferrite nanoparticles.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2013.08.127