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| Article Name : | | | EFFECT OF Al3+ ON STRUCTURAL AND MAGNETIC PROPERTIES OF NANOCRYSTALINE COPPER FERRITE | | Author Name : | | | B.R.KARCHE , R.A.BUGAD , C.S.PAWAR AND T.R.MANE | | Publisher : | | | Ashok Yakkaldevi | | Article Series No. : | | | GRT-2166 | | Article URL : | |  | Author Profile View PDF In browser | | Abstract : | | | Nano-crystaline Alluminum substituted copper ferrite samples CuFe Al O ( 2-2y 2y 4 where y=0.0,0.05,0.15 & 0.25) have been prepared by mill scale fines via conventional oxide ceramic process. The effect of Al3+ on both structural and magnetic properties is studied. Archimedes's method as well as the universal testing machine was used for determining the structural properties of the samples. Meanwhile the types of phase formed and the magnetic properties of the produced samples are investigated using Xray diffraction, Infra red absorption and vibrating sample magnetometer. Cation distribution is estimated on the basis of magnetic moment per unit cell in Bohr magneton calculations. Occupancy of Cu2+ ion on octahedral (B) site of the tetragonal spinel of CuFe O produces tetragonal prolate type distortions in the lattice. The addition of Al3+ 2 4 ion in the host lattice suffers the prolate type distortion which reduces tetragonality (c/a) ratio. The lattice constant, X-Ray density, physical density, porosity, particle size, site radii (rA and rB), bond lengths (A-O and B-O) are calculated for the samples. Two prominent infrared absorption bands for all ferrite samples are observed; one at 600 cm-1 due to tetrahedral (A) interstitial voids and other at 400 cm-1 due to octahedral (B) interstitial voids is observed. All Al3+ substituted copper ferrite samples exhibits the single domain to supper paramagnetic (SD – SP) transition near Curie temperature. | | Keywords : | | - single domain to super-paramagnetic (SD-SP) transition,
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