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Nanocrystalline Ni-Zn ferrites prepared by sol-gel method
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SYSNO ASEP 0163520 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Nanocrystalline Ni-Zn ferrites prepared by sol-gel method Author(s) Popovici, M. (RO)
Savii, C. (RO)
Nižňanský, Daniel (UACH-T) ORCID, SAI, RID
Šubrt, Jan (UACH-T) SAI, RID
Boháček, Jaroslav (UACH-T) SAI
Becherescu, D. (RO)
Caizer, C. (RO)
Enache, C. (RO)
Ionescu, C. (RO)Source Title Journal of Optoelectronics and Advanced Materials. - : NATL INST OPTOELECTRONICS - ISSN 1454-4164
Roč. 5, č. 1 (2003), s. 251-256Number of pages 6 s. Language eng - English Country RO - Romania Keywords nanostructures ; sol-gel processing ; XRD Subject RIV CA - Inorganic Chemistry R&D Projects LN00A028 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z4032918 - UACH-T Annotation 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. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2004
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