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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 78  2019
Effect of Sn on Magnetic and Dielectric Properties of Ni-Co Spinel Ferrite over LF and MF Range
Karunanithi Ashok*, Basheer Masin, Hariharan Sreemoolanadhan and Mariamma Mathew
Pages : 131-136
DOI : 10.1080/0371750X.2019.1632226
Abstract
Nickel-cobalt ferrite (NCF) without Sn-dopant and with (x = 0 to 0.1%), (Ni0.7Co0.3)(Fe2–xSnx)O4+d, have been synthesized through solid-state route. Calcination of oxides at 900oC yielded spinel phase as confirmed by X-ray diffraction. Sn doping does not show much variation in lattice constants, but slightly increases crystallite size. Green compacts have been well sintered in 1150o-1200oC for 10 h. Microstructure of fractured specimens obtained using field emission scanning electron microscope show well packed polygonal grains with 2-3 m size range. Dielectric and magnetic behavior of pristine and Sn-doped NCF have been measured in 100 Hz to 1 MHz range using a precision LCR meter, Sn-doping up to x=0.1 improves the dielectric properties of NCF, but deteriorates the magnetic properties. [Keywords: Magneto-dielectric, Nickel-cobalt ferrite, Spinel ferrite]
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