NMR studies of aging effects in palladium tritide
This paper presents Nuclear Magnetic Resonance (NMR) studies of aging phenomena in palladium tritide. /sup 3/He NMR relaxation parameters have been measured as a function of temperature for 6-, 13-, and 22-month-old beta phase palladium tritide. The most significant result of this study is the observation of a solid/fluid phase transition near 250 K of /sup 3/He that has accumulated in the PdT/sub x/ substrate via triton decay. Although the existence of solid helium at relatively high temperatures had been predicted for helium in metals, it had not previously been confirmed in any metal/helium system. The observed melting temperatures, together with the known equation of state for /sup 4/He, allow a determination of the helium density as a function of age. The atomic density obtained in this way is approximately 2.0 times that of palladium metal, agreeing with densities inferred from dilatometric measurements of other metal tritides and also with predictions based on the concept of dislocation loop punching by highly overpressurized He bubbles. The /sup 3/He signal in the 22-month-old sample was sufficiently strong to allow a detailed study of melting as a function of temperature, and provides information on the distribution of densities over the ensemble of bubbles.
- Research Organization:
- EG and G Mound Applied Technologies, Miamisburg, OH (USA)
- OSTI ID:
- 5852048
- Report Number(s):
- CONF-880505-
- Journal Information:
- Fusion Technol.; (United States), Journal Name: Fusion Technol.; (United States) Vol. 14:2; ISSN FUSTE
- Country of Publication:
- United States
- Language:
- English
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74 ATOMIC AND MOLECULAR PHYSICS
AGE HARDENING
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DENSITY
DIFFUSION
ELEMENTS
EQUATIONS
EQUATIONS OF STATE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
HARDENING
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
HIGH TEMPERATURE
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MAGNETIC RESONANCE
MELTING
METALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
PALLADIUM
PARAMETRIC ANALYSIS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLATINUM METALS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
RELAXATION
RESONANCE
SOLIDS
STABLE ISOTOPES
TRANSITION ELEMENTS
TRITIUM COMPOUNDS
TRITONS