THERMODYNAMIC PROPERTIES OF KRYPTON. VIBRATIONAL AND OTHER PROPERTIES OF SOLID ARGON AND SOLID KRYPTON

Journal Article · Fri Dec 15 04:00:00 EST 1961 · Proc. Phys. Soc. (London)

DOI:https://doi.org/10.1088/0370-1328/78/6/347· OSTI ID:4802132

Beaumont, R H; Chihara, H; Morrison, J A

Calorimetric methods were used to measure thermodynamic properties of solid and liquid krypton. Besides heat capacities and vapor pressures over a range of temperatures, the following were obtained: heat of fusion == 392.0 plus or minus 2.3 cal mole/sup -1/, T(tr.pt.) = 115.77/sub 6/ deg p (tr.pt.)= 548.7 plus or minus 0.1 mm, heat of vaporization at 116.85 deg K = 2179.2 plus or minus 0.9 cal mole/sup -1/ and at the normal boiling point = 2162 plus or minus 1 cal mole/sup -1/. Properties of solid argon and solid krypton were derived, in particular, the apparent Debye characteristic temperatures at 0 deg K and as a function of temperature, the heats of sublimation at 0 deg K, the static lattice energies and the zero point energies. Results of thermal measurements on the solids were correlated with expansivity and compressibility results, and inconsistencies were resolved. Calorimetric results are internally con sistent. The shapes of curves of THETA /sub D/(T) against temperature indicate that anharmonic contributions to the vibrational properties of solid argon and solid krypton are appreciable, particularly in the region T > THETA /sub o//10. Below the melting points, C/sub p/ for argon and krypton increases rapidly with temperature. This is interpreted as an effect of vacancy formation in the solids. Enthalpies of formation are found to be 1280 plus or minus 130 cal mole/sup -1/ for argon and 1770 plus or minus 200 cal mole/sup -1/ for krypton. These are about two-thirds of values estimated from theory. An effect of vacancy formation may also be seen in vapor pressures. (auth)

• Research Organization: National Research Council, Ottawa
• NSA Number: NSA-16-013819
• OSTI ID: 4802132
• Journal Information: Proc. Phys. Soc. (London), Journal Name: Proc. Phys. Soc. (London) Vol. Vol: 78
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ARGON
BOILING
CALORIMETERS
DEBYE TEMPERATURE
DEFECTS
DIAGRAMS
ENERGY
ENTHALPY
ERRORS
EVAPORATION
EXPANSION
KRYPTON
LATTICES
LIQUIDS
LOW TEMPERATURE
MATHEMATICS
MEASURED VALUES
MELTING
MELTING POINTS
OSCILLATIONS
PHYSICS
PRESSURE
SOLIDS
SPECIFIC HEAT
SUBLIMATION
TEMPERATURE
THERMODYNAMICS
VACANCIES
VAPORS