Accession Number : ADA114869

Title :   Thermodynamics of High Temperature Materials.

Descriptive Note : Annual rept. 1 Oct 81-1 Apr 82,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON DC

Personal Author(s) : Abramowitz,S ; Cezairliyan,A ; Mies,F ; Julienne,P

PDF Url : ADA114869

Report Date : Sep 1981

Pagination or Media Count : 107

Abstract : Heat capacity and electrical resistivity of graphite have been measured in the range of 2500 to 3600 K. Thermal expansion of tantalum has been measured in the range of 1500 to 3200 K. Radiance temperature (at 653 nm) of tungsten at its melting point has been determined. The enthalpy of graphite has been determined from 273 to 1173 K. The thermodynamic properties of diatomic molecules at elevated temperatures have been investigated and a formalism developed to include contributions from both the continuum states and the metastable states associated with rotational barriers. The determination of barriers to internal rotation for inorganic species has been reviewed.

Descriptors :   *Heat resistant materials, *Thermodynamics, *Graphite, *Tantalum, *Tungsten, *Diatomic molecules, *Lithium, *Sodium, High temperature, Specific heat, Electrical resistance, Thermal expansion, Thermal radiation, Enthalpy, Thermodynamic properties

Subject Categories : Metallurgy and Metallography
      Miscellaneous Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE