Accession Number : AD0698358

Title :   EQUILIBRIUM MEASUREMENTS IN HIGH MELTING MATERIALS.

Descriptive Note : Technical rept., 1 Apr 68-30 Jun 69,

Corporate Author : CINCINNATI UNIV OHIO

Personal Author(s) : Hoch,Michael

Report Date : OCT 1969

Pagination or Media Count : 29

Abstract : The methods available to determine the specific heat of metals at elevated temperature are reviewed. All methods used give data which agree with each other. The high temperature specific heat for metals can be represented by an equation of the type C sub p = 3RF (theta sub D/T) + cT + dT to the 3rd power between theta sub D, the Debye temperature and the melting point. The rapid rise in specific heat at high temperatures is due to the contribution of anharmonic vibrations to the specific heat and not to the formation of vacancies. The accuracy of 1% in the specific heat data available presently is not sufficient to determine the energy and entropy of formations of vacancies, and their concentration. (Author)

Descriptors :   (*HEAT RESISTANT ALLOYS, SPECIFIC HEAT), (*CALORIMETRY, HEAT RESISTANT ALLOYS), MEASUREMENT, CRYSTAL DEFECTS, COPPER, MOLYBDENUM, HIGH TEMPERATURE, (U)HIGH TEMPERATURE

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE