Accession Number:

AD0775367

Title:

Thermal Conductivity Standard Reference Materials from 6 to 280K: VI. NBS Sintered Tungsten,

Descriptive Note:

Corporate Author:

NATIONAL BUREAU OF STANDARDS BOULDER COLO CRYOGENICS DIV

Personal Author(s):

Report Date:

1974-01-01

Pagination or Media Count:

59.0

Abstract:

Thermal conductivity, electrical resistivity, Lorenz ratio, and thermopower data are reported for two specimens of NBS sintered tungsten for temperatures from 6 to 280K. Variability of this tungsten was studied by means of electrical resistivity and residual resistivity measurements on 39 specimens. These data indicate a material variability of about plus or minus 10 in thermal conductivity at helium temperatures. Above 90K variation in thermal conductivity is only about plus or minus 1. To reduce the uncertainty caused by specimen variation at low temperatures, characterization by residual electrical resistivity data is described. By this procedure the low temperature uncertainty is reduced to about plus or minus 3. Author

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE