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
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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.
- 28.Verenkar VMS, Rane KS, Sawant PY. Hydrazine method of synthesis of γ-Fe2O3 useful in ferrite preparation. Part IV- preparation and characterization of magnesium ferrite, MgFe2O4 from γ-Fe2O3 obtained from hydrazinated iron oxyhydroxides and iron(II) carboxylato-hydrazinates. J Mater Sci: Mater Electron. 1999;10:133–40.Google Scholar
- 29.Gonsalves LR, Mojumdar SC, Verenkar VMS. Synthesis of cobalt nickel ferrite nanoparticles via autocatalytic decomposition of the precursor. J Mater Sci. 2010;100:789–92.Google Scholar
- 38.Gawas UB, Verenkar VMS, Patil DR. Nanostructured ferrite bases electronic nose sensitive to ammonia at room temperature. Sens Transducers. 2011;134(11):45–55.Google Scholar
- 39.Sawant SY, Kannan KR, Verenkar VMS. Synthesis, characterization and thermal analysis of nickel manganese fumarato-hydrazinate. In: Pillai CGS, Ramakumar KL, Ravindran PV, Venugopal V, editors. Proceedings of 13th National Symposium on Thermal Analysis, B.A.R.C., Mumbai. Mumbai: Indian Thermal Analysis Society; 2002. p. 154–5.Google Scholar
- 40.Mendham J, Denney RC, Barnes JD, Thomas M, Sivashankar B. Vogel’s textbook of quantitative chemical analysis (Vth edition).Google Scholar