Počet záznamů: 1  

Nanocrystalline Ni-Zn ferrites prepared by sol-gel method

  1. 1.
    0163520 - UACH-T 20033074 RIV RO eng J - Článek v odborném periodiku
    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
    Grant CEP: GA MŠk LN00A028
    Výzkumný záměr: CEZ:AV0Z4032918
    Klíčová slova: nanostructures * sol-gel processing * XRD
    Kód oboru RIV: CA - Anorganická chemie
    Impakt faktor: 0.996, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0001285