INVESTIGADORES
MERCADER Roberto Carlos
artículos
Título:
Synthesis and magnetic characterization of magnetite particles embedded in mesoporous MCM-41
Autor/es:
N. A. FELLENZ, S. G. MARCHETTI, J. F. BENGOA, R. C. MERCADER AND S. J. STEWART
Revista:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Referencias:
Año: 2005 p. 1 - 5
ISSN:
0304-8853
Resumen:
A solid of 7.7 wt.% iron-loaded MCM-41 was obtained by impregnating the mesoporous material with a 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. » 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.
