The Optical and Magneto-Optical Properties of Nanostructured Oxides of 3d-Metals

Abstract

The electronic properties of nanostructured strongly correlated oxides CuO, Y₃Fe₅O₁₂, and FeBO₃ that include the fundamental absorption region, low-energy electron excitations, and phonon modes have been investigated by the methods of optical spectroscopy. Absorption and reflection spectra, Raman spectra, and ellipsometry measurements were on the samples of nanostructured ceramics carried out. High-density nanoceramics have been prepared by the shock-wave loading methods using high-pressure torsion from coarse-grain oxide powders. Strong diffusions of the fundamental absorption edge are revealed for all nanoceramics. Anomalous red shift of the absorption edge was observed in CuO nanooxide. The features of the optical functions in nanooxides of 3d-metals is found to be attributed to the high degree of imperfection of the nanooxides, peculiarities of the electronic structure of the strongly correlated oxides and inherent the electronic phase separation.