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Low-Temperature Specific Heats of Solid Neon and Solid Xenon

Low-Temperature Specific Heats of Solid Neon and Solid Xenon The specific heats of solid neon and xenon have been measured in the temperature range 1.5 to 24°K, using a calorimeter with a mechanical heat switch. Carbon resistance thermometers were calibrated against a gas thermometer and the helium vapor-pressure scale. The results were analyzed to obtain the temperature dependence of the Debye temperature, Θ c ( T ) . In the range 0.020 ≲ T Θ 0 c ≲ 0.505 , the data were fitted with an expression of the form Θ c ( T ) = Θ 0 c + A T 2 , where Θ 0 c is the Debye temperature at 0°K. This procedure gave Θ 0 c = 74.6 ± 1.0 °K for neon and Θ 0 c = 64.0 ± 0.8 °K for xenon. The results for Θ c ( T ) are compared with the calculations of Bernardes, Horton, and Leech, and Barron and Klein, based on Mie-Lennard-Jones potentials for the interaction energy between two atoms. Tables of the following smoothed thermodynamic properties between 1.0 and 24°K are given in Table I: specific heat at constant pressure, specific heat at constant volume, entropy, and enthalpy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Low-Temperature Specific Heats of Solid Neon and Solid Xenon

Physical Review , Volume 142 (2) – Feb 11, 1966
6 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1966 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.142.490
Publisher site
See Article on Publisher Site

Abstract

The specific heats of solid neon and xenon have been measured in the temperature range 1.5 to 24°K, using a calorimeter with a mechanical heat switch. Carbon resistance thermometers were calibrated against a gas thermometer and the helium vapor-pressure scale. The results were analyzed to obtain the temperature dependence of the Debye temperature, Θ c ( T ) . In the range 0.020 ≲ T Θ 0 c ≲ 0.505 , the data were fitted with an expression of the form Θ c ( T ) = Θ 0 c + A T 2 , where Θ 0 c is the Debye temperature at 0°K. This procedure gave Θ 0 c = 74.6 ± 1.0 °K for neon and Θ 0 c = 64.0 ± 0.8 °K for xenon. The results for Θ c ( T ) are compared with the calculations of Bernardes, Horton, and Leech, and Barron and Klein, based on Mie-Lennard-Jones potentials for the interaction energy between two atoms. Tables of the following smoothed thermodynamic properties between 1.0 and 24°K are given in Table I: specific heat at constant pressure, specific heat at constant volume, entropy, and enthalpy.

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Feb 11, 1966

References