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), Vol. 14:2; Conference: 3. topical meeting on tritium technology in fission, fusion and isotopic applications, Toronto, Canada, 1-6 May 1988
- Country of Publication:
- United States
- Language:
- English
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Low-temperature sup 3 He NMR studies in aged palladium tritide
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
HELIUM 3
DIFFUSION
PALLADIUM
NUCLEAR MAGNETIC RESONANCE
TRITIUM COMPOUNDS
PHASE STUDIES
AGE HARDENING
DENSITY
EQUATIONS OF STATE
FLUIDS
HELIUM 4
HIGH TEMPERATURE
MELTING
PARAMETRIC ANALYSIS
RADIOLYSIS
RELAXATION
SOLIDS
TRITONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELEMENTS
EQUATIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HARDENING
HELIUM ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MAGNETIC RESONANCE
METALS
NUCLEI
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLATINUM METALS
RADIATION CHEMISTRY
RADIATION EFFECTS
RESONANCE
STABLE ISOTOPES
TRANSITION ELEMENTS
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
700206 - Fusion Power Plant Technology- Environmental Aspects