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Localized centers and correlated magnetic spin systems in titanium oxides nanocomposites

Guskos N.

Archives of Materials Science and Engineering

2015

Vol. 74, nr 1

23--31

Purpose: The aim of this review is recapitulating the FMR/EPR study of localized magnetic centers and clusters in co modified nanocomposites titanium dioxide by nitrogen and group of transitions magnetic metals. Design/methodology/approach: In some cases, modified in this way, titanium dioxides improve their photocatalytic properties where localized magnetic moments and spincorrelated systems play a very important role in their physical properties that are important in their applications. Findings: The modified titanium dioxides without introducing ions from the group of transition metals may have EPR spectra of free radicals and titanium ions at a lower oxidation state, which are responsible for the increase in photocatalytic activity. Modifying the additional magnetic ions from the group of transition metals there are additional very intense FMR spectra which are strongly temperature dependent. Static measurements (DC), magnetization as a function of temperature indicate the formation of magnetic orderings, superparamagnetic and paramagnetic state. Research limitations/implications: Modified nano-titanium dioxide composite prognosis applications in catalysis, photovoltaic or in spintronics. Originality/value: A large amount of work appears annually associated with the modified titanium dioxide by the various elements and especially from the group of transition metals and noble gases. Against this background, very little work appears on their dynamic and static magnetic properties that may impact on their ability applications.