Optical properties of tantalum carbide from the infrared to the near ultraviolet

Journal Article · Sun Jan 15 04:00:00 EST 1984 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.29.836· OSTI ID:5182084

Modine, F A; Major, R W; Haywood, T W; Gruzalski, G R; Smith, D Y

Optical properties of a nearly stoichiometric single crystal of tantalum carbide are reported. Specular reflectance was measured between 0.03 and 6.0 eV, and ellipsometry measurements were made between 1.2 and 4.6 eV. The ellipsometry results were used to fix the value of the phase obtained from a Kramers-Kronig analysis of the reflectance over a finite energy interval, and optical functions were computed between 0 and 6 eV. The optical conductivity at zero photon energy agrees well with the electrical conductivity obtained from resistivity measurements made by the van der Pauw method. Intraband contributions to the optical properties are assessed in terms of both one-carrier and two-carrier models. Broad structure near 5 eV is interpreted as due to interband transitions between states near the square face of the Brillouin zone.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5182084
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 29:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CARBIDES
CARBON COMPOUNDS
CORRELATIONS
CRYSTALS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELLIPSOMETRY
EXPERIMENTAL DATA
INFORMATION
INFRARED RADIATION
KRAMERS-KRONIG CORRELATION
MEASURING METHODS
MONOCRYSTALS
NEAR ULTRAVIOLET RADIATION
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
REFLECTIVITY
STOICHIOMETRY
SURFACE PROPERTIES
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION
VISIBLE RADIATION