Magnetic properties of NiCuZn ferrites synthesized by oxalate precursor method

• Published in: Journal of magnetism and magnetic materials Vol. 305; no. 1; pp. 110 - 119
• Main Authors: Ghodake, S.A., Ghodake, U.R., Sawant, S.R., Suryavanshi, S.S., Bakare, P.P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2006; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Initial permeability; Magnetic properties and materials; Magneticproperties; Magnetization; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; NiCuZn ferrites; Physics; XRD; NiCuZn ferrites; XRD; Magnetization; Magneticproperties; Initial permeability; Stoichiometry; Ionic radius; Lattice parameters; Ferrites; Impurities; Magnetic permeability; Microstructure; Coprecipitation; Magnetic properties
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2005.11.041

Ni–Cu–Zn ferrites have been synthesized by employing co-precipitation technique using oxalate precursors. X-ray diffractograms did not show impurity phases, indicating single-phase formation of the ferrites. The diffractograms of oxalate complex decomposed at 650 °C show that ferritization is complete up to 650 °C. Lattice parameter a (Å) was found to decrease with the addition of Ni 2+ which is attributed to ionic sizes of Ni 2+ (0.69 Å), which replaces Cu 2+ (0.72 Å). From the thermogravimetric studies it is observed that the experimentally observed total mass loss (%), agrees with theoretically calculated mass loss (%) indicating maintenance of requisite stoichiometry. Initial permeability ( μ i ) shows increase when Ni 2+ is added up to x = 0.15 while for ( x > 0.15 ), it decreases. The increase in initial permeability ( μ i) is attributed to monotonic increase in Ms, and K 1 on addition of Ni 2+. However, the microstructure and density (porosity) also influence μ i variations. The decrease in μ i is attributable to increase of K 1. The composition with density 91.14% exhibits large μ i which also tends to increase with temperature up to 60 °C. Thus its usable range extends up to 60 °C. This samples has T c near to 160 °C.