Structure and Magnetic Properties of Nanocrystalline NiFe2O4 Prepared via Precipitation Route

T. Žáka, B. Davida, A. Ćosovićb, V. Ćosovićc, D. Živkovićd, N. Talijanc aCEITEC IPM, Institute of Physics of Materials AS CR, v.v.i., Žižkova 22, CZ-616 62 Brno, Czech Republic bInstitute for Technology of Nuclear and Other Mineral Raw Materials, Franse d'Eperea 86, 11000 Belgrade, Serbia cInstitute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia dTechnical Faculty in Bor, University of Belgrade, Vojske Jugoslavije 12, 19210 Bor, Serbia

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Nanocrystalline Ni-ferrite was synthesized by modified precipitation method in which soluble starch is used as dispersing agent and Na2CO3 as a precipitating agent. NiSO4·6H2O and Fe(NO3)3·9H2O were used as precursors for nickel and ferric oxide, respectively. The obtained nanocrystalline Ni-ferrite was analysed and discussed through structural, compositional and magnetic characterization. Formation of pure NiFe2O4 phase with average crystallite size of 21 nm has been confirmed by X-ray diffraction analysis (XRD). The determined phase composition was additionally supported by results of 57Fe Mössbauer phase (MS) analysis and material's nanocrystalline structure by field emission scanning electron microscopy (FE-SEM). Thermomagnetic behaviour was studied up to 800 °C. The obtained room temperature magnetic hysteresis loop, recorded by means of a vibrating sample magnetometer (VSM), exhibits characteristic "S" shape of the soft magnetic material with the measured coercivity of about 10 kA/m and the specific moment up to 40 Am2/kg.

DOI: 10.12693/APhysPolA.126.142 PACS numbers: 61.05.cp, 75.50.Tt, 81.07.Bc, 81.07.Wx