Density of liquid /sup 4/He at freezing and entropy of solid /sup 4/He at low temperatures

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.14.1911· OSTI ID:7344741

Hanson, H N; Berthold, J E; Seidel, G M; Maris, H J

The density of liquid /sup 4/He has been measured along the melting curve in the temperature range 0.1--0.82 K by observing the change with temperature of the resonant frequency of a superconducting microwave cavity immersed in the liquid. Relative changes in density as small as 4 x 10/sup -9/ could be resolved. From the results the entropy of solid /sup 4/He was obtained by using the Clausius-Clapeyron equation in conjunction with values for the isobaric-thermal-expansion coefficient and entropy of the liquid calculated from other data. No evidence for an anomalous linear temperature term in the entropy of the solid was found. The data are shown to be in good agreement with published measurements of the Debye temperature of the solid by Gardner, Hoffer, and Phillips. (AIP)

• Research Organization: Department of Physics, Brown University, Providence, Rhode Island 02912
• OSTI ID: 7344741
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 14:5; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
ENTROPY
EVEN-EVEN NUCLEI
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MELTING POINTS
NUCLEI
PHYSICAL PROPERTIES
STABLE ISOTOPES
SUPERFLUIDITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE