Preparation, spectroscopic and thermal analysis of hexa-hydrazine nickel cobalt ferrous succinate precursor and study of solid-state properties of its nanosized thermal product, Ni0.5Co0.5Fe2O4
Nickel cobalt ferrite, Ni0.5Co0.5Fe2O4, has been prepared by precursor combustion technique from hexa-hydrazine nickel cobalt ferrous succinate precursor. The precursor was characterized by chemical analysis, CHNS analysis, infrared spectroscopy, TG–DTA and mass loss studies. The thermal data show how the precursor decomposes in four steps to give stable ferrite phase. The precursor decomposes autocatalytically once initially ignited, to give the ‘as-prepared’ nano-spinel ferrite. The X-ray diffraction analysis reveals single cubic spinel phase structure. The infrared measurements between 4000 and 350 cm−1 confirmed the intrinsic cation vibrations of the spinel structure. The SEM image clearly shows the nanosized nature of the ferrite. The dielectric constant and loss tangent are found to decrease with increase in frequency which is due to Maxwell–Wagner interfacial polarization. The loss tangent shows a relaxation peak at ~1 kHz. The variation of DC electrical resistivity with temperature indicates semiconductor behaviour. The temperature- and field-dependent magnetization data of ‘as-prepared’ ferrite reveal that the lattice has either a canted or partially misaligned spin structure due to the nanosized nature of the ferrite.
KeywordsHexa-hydrazine metal succinate precursor Thermal analysis Auto catalytic decomposition Magnetic nanoparticles Dielectric relaxation Magnetic properties Magnetic anisotropy
The authors are grateful for financial support from DST, New Delhi through the Nano-Mission Project, No. SR/NM/NS-86/2009 and also from FIST. The author D.M. Coutinho is grateful to UGC, New Delhi for financial assistance under UGC-BSR fellowship, No. F.4-1/2006 (BSR)/7-69/2007 (BSR) and also under UGC-SAP programme. The authors are also thankful to Mr. Girish Prabhu, N.I.O. Goa for XRD facility and Mr. M.G. Lanjewar, Goa University for recording SEM images.
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