Low-temperature ultrasonic study of trapped hydrogen in niobium
The elastic constants and attenuation of niobium containing low concentrations of oxygen and hydrogen (deuterium) have been measured between 0.5 and 15 K, as a function of temperature, frequency, polarization, and hydrogen isotope. Two relaxations were observed for the C' mode. No observable relaxations appeared in C/sub 44/ or the bulk modulus. At 10 MHz the relaxations occurred at 2.5 and 5.5 K for H, shifting to higher temperature for D. The relaxation strength of the low-temperature process is linear in H concentration, while the higher-temperature process is nonlinear. The low-temperature process exhibits an apparent activation energy of 1.8 meV, with a nonclassical temperature dependence of the relaxation strength. The constraints which these results place upon a delocalized-wave model are discussed.
- Research Organization:
- Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 5223694
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 29:2; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103 -- Metals & Alloys-- Mechanical Properties
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ATTENUATION
CRYSTALS
DATA
DEUTERIUM
ELASTICITY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FREQUENCY DEPENDENCE
FREQUENCY RANGE
HYDROGEN ADDITIONS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MECHANICAL PROPERTIES
METALS
MHZ RANGE
MONOCRYSTALS
NIOBIUM
NONLINEAR PROBLEMS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXYGEN ADDITIONS
POLARIZATION
RELAXATION
SOUND WAVES
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
ULTRASONIC WAVES
VERY LOW TEMPERATURE