Optical conductivity of bcc transition metals: V, Nb, Ta, Cr, Mo, W

Journal Article · Tue Apr 15 04:00:00 EST 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.21.3173· OSTI ID:5470611

Nestell, Jr, J E; Christy, R W

The optical constants n and k were determined for the bcc transition metals of the V and Cr groups from reflection and transmission measurements in the spectral range 0.5 -- 6.5 eV. The optical measurements were made at room temperature on polycrystalline thin films, vacuum evaporated rapidly onto high-temperature (700 -- 1000 /sup 0/C) fused-quartz substrates. The films were found to be well crystallized, and the reflectance of opaque films agreed with previous bulk values. For the thin-film results to be representative of bulk crystals, high substrate temperature was essential for the Cr group, and rapid evaporation rate for the V group. The values for Cr are a significant improvement over earlier results of Johnson and Christy, but those for V are only a slight improvement. Some recent calculations of the interband optical conductivity agree reasonably well with our results for V, Cr, Nb, and Mo. Direct transitions between d bands seem to account for the optical structure.

• Research Organization: Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755
• OSTI ID: 5470611
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 21:8; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ABSORPTION
BCC LATTICES
CHROMIUM
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
FILMS
METALS
MOLYBDENUM
NIOBIUM
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
REFLECTIVITY
REFRACTORY METALS
SURFACE PROPERTIES
TANTALUM
TRANSITION ELEMENTS
TUNGSTEN
VANADIUM