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THERMAL PROPERTIES OF CARBON-IMPREGNATED POROUS GLASS AT LOW TEMPERATURES.

Author(s) : LAWLESS W. N.

Type of article: Article

Summary

SPECIFIC HEAT AND THERMAL CONDUCTIVITY MEASUREMENTS 2-30 K ARE REPORTED ON A CARBON-IMPREGNATED POROUS GLASS WHICH IS USED TO MAKE CARBON-GLASS THERMOMETERS. THE SPECIFIC HEAT IS CONSIDERABLY LARGER THAN THAT OF FUSED SILICA DUE TO THE SQUARE T SURFACE-AREA CONTRIBUTION, AND GOOD AGREEMENT WITH LITERATURE ESTIMATES OF THE SQUARE T TERM IS OBTAINED. A SMALL EINSTEIN TERM IS SEEN AT 2.2 K DUE POSSIBLY EITHER TO THE SURFACE-BOUND HYDROXYL GROUPS OR TO THE IMPREGNATED CARBON FILAMENTS. THE THERMAL CONDUCTIVITY DATA DO NOT DISPLAY THE PLATEAU AROUND 10 K CHARACTERISTIC OF AMORPHOUS MATERIALS DUE TO THE DIFFRACTION OF THERMAL PHONONS BY THE SMALL PORES. IT IS FOUND THAT THE CARBON PLAYS A NEGLIGIBLE ROLE IN THE THERMAL PROPERTIES OF CARBON-IMPREGNATED POROUS GLASS IN THIS TEMPERATURE RANGE.

Details

  • Original title: THERMAL PROPERTIES OF CARBON-IMPREGNATED POROUS GLASS AT LOW TEMPERATURES.
  • Record ID : 1982-0007
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 52 - n. 5
  • Publication date: 1981
  • Document available for consultation in the library of the IIR headquarters only.

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