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High temperature EPR study of the M3Fe4V6O24 (M = Cu, Zn, Mg and Mn)

Guskos N., Zolnierkiewicz G., Typek J., Pilarska M., Aidinis C., Blonska-Tabero A.

Materials Science Poland

2016

Vol. 34, No. 3

517--522

Electron paramagnetic resonance (EPR) spectra of M3Fe4 V6 O24 (M = Cu, Zn, Mg and Mn) compounds in high temperature range (293 K to 493 K) have been investigated. The role of magnetic (Cu, Mn) and non-magnetic (Zn, Mg) ions in M3Fe4 V6 O24 structure in formation of magnetic resonance spectra was studied. Temperature dependence of EPR parameters: resonance field, linewidth and integrated intensity were examined. Similarities and differences in temperature behavior of these parameters has been discussed in terms of different relaxation mechanisms and magnetic interactions in the spin systems. An important role of additional magnetic ions (M = Mn or Cu) in the M3Fe4 V6 O24 structure has been identified and its consequences considered.

Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites

Guskos N., Zolnierkiewicz G., Guskos A., Typek J., Berczynski P., Dolat D., Mozia S., Aidinis C., Morawski A. W.

Nukleonika

2015

Vol. 60, No. 3, part 1

411--416

Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential infl uence of the photocatalytic properties of the studied nanocomposites.