Accession Number : AD0258133

Title :   X-RAY INVESTIGATION OF THE CHARACTERISTIC TEMPERATURE OF TUNGSTEN

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s) : ALEXOPOULOS,K.D. ; SHAW,C.H.

Report Date : FEB 1961

Pagination or Media Count : 1

Abstract : The ratio of the intensity of the powder diffraction line (116-235) to that of the line (011) for a W wire has been determined for Mo K alpha radiation (0.71A) for temperatures 1.4, 17, 44, 145, and 294 K. X-ray intensities were measured with a proportional counter. Previous specific heat measurements by Horowitz and Daunt (Phys. Rev. 91:1099, 1953) gave a peak at 17 K in the curve of the Debye characteristic temperature as absolute temperature T, whereas more recent measurements show no such maximum. The results of Horowitz and Daunt indicated an expected increase in the x-ray scattering ratio of some 4% between 1.4 and 17 K. Accuracy of measurement of the scattered x-ray intensities was adequate for purposes of comparison, and the x-ray results lend support to the specific heat measurements of Horowitz and Daunt. The remainder of the characteristic temperature curve to 294 K is discussed. (Author)

Descriptors :   *TUNGSTEN, CRYSTAL LATTICES, DETERMINATION, INTENSITY, MEASUREMENT, TEMPERATURE, THERMODYNAMICS, VIBRATION, WIRE, X RAY DIFFRACTION, X RAYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE