Nanocrystalline Ni-Zn ferrites prepared by sol-gel method

0163520 - UACH-T 20033074 RIV RO eng J - Journal Article
Popovici, M. - Savii, C. - Nižňanský, Daniel - Šubrt, Jan - Boháček, Jaroslav - Becherescu, D. - Caizer, C. - Enache, C. - Ionescu, C.
Nanocrystalline Ni-Zn ferrites prepared by sol-gel method.
Journal of Optoelectronics and Advanced Materials. Roč. 5, č. 1 (2003), s. 251-256. ISSN 1454-4164. E-ISSN 1841-7132
R&D Projects: GA MŠMT LN00A028
Institutional research plan: CEZ:AV0Z4032918
Keywords : nanostructures * sol-gel processing * XRD
Subject RIV: CA - Inorganic Chemistry
Impact factor: 0.996, year: 2003

Nanocrystalline Ni-Zn ferrites have been synthesized in silica matrix by sol-gel processing and thermal treatment at 1100degreesC. Samples with weight fraction of 20% Ni1-xZnxFe2O4 in silica matrix were obtained for x = 0.15, 0.35, 0.50, 0.65 and characterized by X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), Mossbauer spectroscopy (MS) at room temperature and vibrating sample magnetometry (VSM) measurements. The cubic spinel structure is proved both by XRD and Mossbauer spectroscopy. The ferrites embedded in the matrix have nanoparticles in the range 5-13 nm. The obtained composites, display superposed superparamagnetic and ferrimagnetic behavior, as a function of Zn/Ni ratio. Both lattice constant parameter and average hyperfine fields vary with the degree of substitution of nickel ions with zinc ones.
Permanent Link: http://hdl.handle.net/11104/0001285