"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

NANOCRYSTALLINE Ni-Zn FERRITES PREPARED BY SOL-GEL METHOD

M. Popovici1, C. Savii1,* , D. Niznansky2, J. Subrt2, J. Bohacek2, D. Becherescu3, C. Caizer4, C. Enache1, C. Ionescu1

Affiliation

  1. Institute of Chemistry Timisoara of Romanian Academy., Inorganic Chemistry Lab., 24 Mihai Viteazul Blvd., 1900 Timisoara, Romania
  2. Academy of Sciences of the Czech Republic, Institute of Inorganic Chemistry, Dept. of Solid State Chemistry, 250 68 Rež, Czech Republic
  3. Industrial Chemistry and Environmental Engineering Faculty, Department of Science and Engineering of Oxidic Materials , Piata Victoriei 2, 1900 Timisoara, Romania
  4. Vest University of Timisoara, Faculty of Physics, Department of Electricity and Magnetism, Bd. V. Parvan no. 4, 1900 Timisoara, Romania

Abstract

Nanocrystalline Ni-Zn ferrites have been synthesized in silica matrix by sol-gel processing and thermal treatment at 1100 oC. 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), Mössbauer spectroscopy (MS) at room temperature and vibrating sample magnetometry (VSM) measurements. The cubic spinel structure is proved both by XRD and Mössbauer 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..

Keywords

Nanostructures, sol-gel processing, XRD, TEM, Mössbauer spectroscopy.

Submitted at: July 30, 2002
Accepted at: March 12, 2003

Citation

M. Popovici, C. Savii, D. Niznansky, J. Subrt, J. Bohacek, D. Becherescu, C. Caizer, C. Enache, C. Ionescu, NANOCRYSTALLINE Ni-Zn FERRITES PREPARED BY SOL-GEL METHOD, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 251-256 (2003)