Modified Precipitation Route for Preparation of Nanocrystalline NiFe204

0425433 - ÚFM 2014 RIV RS eng A - Abstrakt
Ćosović, V. - Ćosović, A. - Živković, D. - Žák, Tomáš - David, Bohumil - Talijan, N.
Modified Precipitation Route for Preparation of Nanocrystalline NiFe204.
Serbian Ceramic Society Conference: Advanced Ceramics And Application. Belgrade: Serbian Ceramic Society, 2013 - (Mitić, V.; Obradović, N.; Mančić, L.). s. 30-30. ISBN 978-86-915627-1-7.
[Advanced Ceramics And Application. 30.09.2013-01.10.2013, Belgrade]
Institucionální podpora: RVO:68081723
Klíčová slova: nanocrystalline NiFe2O4 * precipitation method * structural analysis * magnetic properties
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Nanosize Ni-ferrite powders were synthesized by modified precipitation process in which soluble starch was used as dispersing agent. NiS04 'and Fe(N03)3 were used as precursors for NiO and Fe2O3, respectively and Na2CO3 was used as a precipitating agent. Since soluble starch reacts with sodium in alkalization reaction added amount of Na2CO3 had to be determined using the degree of substitution (DS). Two scenarios in which starch reacts with sodium up to level when DS= 1 and DS=3 were studied. The obtained Ni-ferrite powders were analyzed and discussed through structural, compositional and magnetic characterization. Formation of nanocrystalline NiFe2O4 phase was confirmed by the subsequent X-Ray diffraction analysis (XRO), Fourier transform infrared spectroscopy (FTIR) and 57Fe Mossbauer spectroscopy (MS). Although, the average crystallite size of 21 nm was determined by XRD for both studied powders the results of field-emission and conventional scanning electron microscopy FE-SEM/SEM demonstrate noticeable differences in morphology and particle size. The obtained room temperature magnetic hysteresis loops, measured on vibrating sample magnetometer (VSM), illustrate subtle differences between magnetic properties of studied materials and exhibit characteristic "S" shape with coercivity of about 10 kA/m and the specific moment up to 40 Am2/kg.
Trvalý link: http://hdl.handle.net/11104/0231497