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Investigation of chemical and grain boundary effects in highly ordered Sr2FeMoO6: XPS Mössbauer studies

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. Raekers1,*, K. Kuepper1,#, H. Hesse1, I. Balasz2, I. G. Deac2, S. Constantinescu3 , E. Burzo2,

Editorial: Journal of Optoelectronics and Advanced Materials (ISSN 1454-4164), 8, p.455-460, 2006.

Rezumat:

We have studied the oxidation states of Fe and Mo and the presence of grain boundaries in the magneto resistive (MR) compounds Sr2FeMoO6 by means of x-ray photoelectron spectroscopy (XPS), Mössbauer spectroscopy and electrical resistivity measurements. XPS of the Mo 3d and Fe 3s core levels is indicating a mixed valence state involving around 30% Fe3+- Mo5+ and 70% Fe2+- Mo6+ states. Mössbauer studies confirm the presence of a valence fluctuation state and an essential amount of grain boundaries in the present Sr2FeMoO6 crystals. Resistivities and magnetoresistance studies evidenced strong grain boundary effects.

Cuvinte cheie: Sr2FeMoO6, perovskit dublu, magnetorezistenta, spectroscopiile XPS si Mössbauer, rezistivitate electrica // Sr2FeMoO6, double perovskite, magneto resistance, x-ray photoelectron spectroscopy,