Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method |
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| Authors: | M Penchal Reddy W Madhuri N Ramamanohar Reddy K V Siva Kumar V R K Murthy R Ramakrishna Reddy |
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| Affiliation: | (1) Department of Physics, Ceramic Composite Materials Laboratory, Sri Krishnadevaraya University, Anantapur, 515 055, India;(2) School of Advanced Sciences, VIT University, Vellore, 632014, India;(3) Department of Materials Science and Nanotechnology, Yogi Vemana University, Kadapa, 516 227, India;(4) Microwave laboratory, Indian Institute of Science, Chennai, 600 036, India |
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| Abstract: | The effect of zinc ion substitution for nickel on structural and magnetic properties of NiZn ferrites is reported. The spinel
ferrite system Ni1-xZnxFe2O4 with x = 0.2, 0.3, 0.4 and 0.5 was prepared by microwave sintering method. The uniaxially pressed samples were sintered at
various temperatures such as 900°C, 1000°C and 1100°C for 30 min. X-ray diffraction patterns of the samples indicate the formation
of single-phase cubic spinel structure. SEM micrographs show that grain size increases with increasing zinc content and sintering
temperature. The elemental composition of these ferrites was analyzed by EDS. Lattice constant increases with increase in
zinc content, obeying Vegard’s law. The effect of composition and sintering temperature on initial permeability as the function
of frequency and temperature was studied. The initial permeability of NiZn ferrite increases greatly with increasing Zn content
and sintering temperature. The dependence of initial permeability with respect to temperature shows the decrease in the Curie
point with increase in zinc content, is the normal behavior of ferrites. The relative loss factor (tand | / |
mi ) ({{{\tan \delta }} \left/ {{{\mu_i}}} \right.}) of the order of 10−2 to 10−5 in the frequency range from 100 Hz to 1 MHz indicates that the prepared ferrites have relatively high purity. |
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