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SOL-GEL DERIVED IRON OXIDE-SILICA NANOCOMPOSITES, STARTING FROM IRON CHLORIDE AND IRON NITRATE

M. Popovici1, C. Savii1,* , C. Enache1, D. Niziiansky2, I. Subrt2, E. Vecemikova2

Affiliation

  1. Romanian Academy - Timisoara Brh., 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 Ref, Czech Republic

Abstract

Sol-gel Fez03-SiOz composites have been obtained, using tetraethoxysilane as precursor and ferric salts (chloride and nitrate), for a target composition of 32 wt. % Fe203. The samples were characterized by thermal analysis, transmission electron microscopy, electron diffraction and X-ray diffraction. Mossbauer spectroscopy showed that some of the resulting materials possess superparamagnetic and ferrimagnetic properties, indicating a distribution of particles size in nanometer and tens of nanometers range. The different results obtained suggest that the formation of iron oxide phases depends on the precursors employed and the atmosphere of thermal treatment..

Keywords

Sol-gel processing, Nanophase-materials, Mössbauer spectroscopy.

Submitted at: Nov. 3, 2004
Accepted at: Sept. 22, 2005

Citation

M. Popovici, C. Savii, C. Enache, D. Niziiansky, I. Subrt, E. Vecemikova, SOL-GEL DERIVED IRON OXIDE-SILICA NANOCOMPOSITES, STARTING FROM IRON CHLORIDE AND IRON NITRATE, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2753-2762 (2005)