An ultrasonic study of liquid-helium filled porous ceramics
Thesis/Dissertation
·
OSTI ID:7011307
The velocity and attenuation of transverse sound was measured in a variety of liquid-helium-filled, porous ceramics. These measurements were made both above and below the superfluid transition temperature (2.17 K in bulk helium) between the frequencies of 4 and 31 MHz using a pulsed, phase-sensitive technique. An attenuation due to motion of the viscous normal fluid component in the pores was observed and compared to the predictions of Biot. Overall, the observed frequency and temperature dependence of the attenuation was in good agreement with the theoretical predictions over an extended range in poor size.
- Research Organization:
- Delaware Univ., Newark, DE (United States)
- OSTI ID:
- 7011307
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
EVEN-EVEN NUCLEI
FLUIDS
FREQUENCY RANGE
HELIUM 4
HELIUM I
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
MHZ RANGE
MHZ RANGE 01-100
NUCLEI
PHYSICAL PROPERTIES
POROUS MATERIALS
QUANTUM FLUIDS
SOUND WAVES
STABLE ISOTOPES
SUPERFLUIDITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRASONIC WAVES
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
EVEN-EVEN NUCLEI
FLUIDS
FREQUENCY RANGE
HELIUM 4
HELIUM I
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
MHZ RANGE
MHZ RANGE 01-100
NUCLEI
PHYSICAL PROPERTIES
POROUS MATERIALS
QUANTUM FLUIDS
SOUND WAVES
STABLE ISOTOPES
SUPERFLUIDITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRASONIC WAVES