Abstract
The electronic structure and phase composition of (Co41Fe39B20)x(SiO2)1 − x nanocomposites are studied by x-ray absorption near-edge spectroscopy, which is extremely sensitive to the chemical environment of elements in multicomponent compounds. An analysis of the recorded Fe L2, 3, Co L2, 3, B K, Si L2, 3, and O K absorption spectra demonstrates interatomic interactions between the elements of the metallic and dielectric components of the nanocomposites. As a result of these interatomic interactions, a complex multiphase system, whose electronic structure should determine the transport and magnetic properties of the nanocomposites, forms. In particular, the transformation of the fine structure of the iron L2, 3 spectra reflects a change in the ratio of divalent to trivalent iron in its oxides and/or silicates. CoO and complex boron oxides are found to exist in the nanocomposites. The electrical conductivity of a FeO · F2O3 · CoO grain embedded in the silicate-oxide medium of the nanocomposites is controlled by electron exchange between Co2+, Fe2+, and Fe3+ ions. The dielectric component consists of a mixture of silicon oxide and the silicates/borosilicates of transition metals.
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