Optical properties of vanadium pentoxide in the region of photon energies from 2 eV to 14 eV
Measurements of the reflectrance R for V/sub 2/O/sub 5/ single crystals and photon energies h..omega.. from 2 eV to 14 eV are given, and the spectral dependence of the real and imaginary parts of the dielectric constant epsilon and of the refractive index N is calculated for h..omega..< or =7 eV. A discussion of the results obtained is given; and according to it, the optical properties of V/sub 2/O/sub 5/ for 2.2 eV< or =h..omega.. < or =8eV or 9 eV are connected chiefly with 2p (O/sup -2/) ..-->..3d (V/sup +5/) electronic transitions and for h..omega..>8 eV or 9 eV with transitions between the 2p (O/sup -2/) and 4s (V/sup +5/) electronic states. It is shown that the dispersion of epsilon for h..omega.. below the intrinsic absorption edge is chiefly determined by strong optical transitions near 3 eV, and the absorption edge in this material corresponds to the low energy tail of a weak absorption band with a maximum at 2.5 eV. An investigation of the shape of the R (h..omega..) extrema of V/sub 2/O/sub 5/ single crystals is carried out, and a comparison of these characteristics with the analogous dependencies for other oxides of transition metals (SrTiO/sub 3/ and NiO) as well as with the transmission spectra of dilute solutions of V/sub 2/O/sub 5/ is made. On the basis of such an investigation a hypothesis is given about the significant contribution that localized excitations together with interband transitions, make to the optical properties of this material. (AIP)
- OSTI ID:
- 7365460
- Journal Information:
- Opt. Spectrosc. (USSR) (Engl. Transl.); (United States), Vol. 40:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
VANADIUM OXIDES
REFLECTIVITY
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
PERMITTIVITY
CHALCOGENIDES
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties