Synthesis and magnetic characterization of magnetite particles embedded in mesoporous MCM-41

N. A. FELLENZ; S. G. MARCHETTI; J. F. BENGOA; R. C. MERCADER; S. J. STEWART

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Elsevier

Año: 2006 vol. 306 p. 30 - 34

0304-8853

A solid of 7.7 wt% iron-loaded MCM-41 was obtained by impregnating the mesoporous material with an Fe-carrying organic salt after subjecting the matrix to a silylation treatment. The Mössbauer and magnetic results show that the as-prepared composite is mainly made up of fine Fe3O4 particles that display a superparamagnetic relaxation at room temperature and block at ≈42 K. A percentage of ≈24% of the iron-containing phases is magnetically blocked at room temperature, and belongs to Fe3O4 that undergoes the Verwey transition. In addition, there is a minor Fe(III) phase that remains paramagnetic down to 4.2 K. Keywords: Magnetically ordered materials; Nanostructures; Chemical synthesis; Nanofabrications; Magnetic nanoarrays synthesis; Fe3O4; MCM-41; Nanoparticles magnetism; Silylated MCM-41 PACS classification codes: 75.30.Cr; 75.50.Tt; 75.60.Ej