Studies of point-defect interactions in solids using perturbed angular correlations
Vacancy defect production and migration in {sup 111}In doped Au, Pt and Ni following plastic deformation are studied via {sup 111}Cd perturbed {gamma}-{gamma} angular correlations (TDPAC). In all three metals, deformation produces the same defect species as are seen following irradiation. In Au, a particular In-vacancy complex which is probably a trapped divacancy exists in two distinct configurations. Thermal conversion from one configuration to the other occurs near 200K. In Pt, an In-vacancy complex exhibits a strongly temperature dependent electric field gradient, indicating the presence of local resonant modes. In Ni, a relaxed In-trivacancy complex forms via simple, single-step trapping of a migrating trivacancy. Once formed, the In-trivacancy complex in Ni can trap up to four guest H or D atoms. These are bound to the complex with an energy of {approximately}0.5 eV, irrespective of isotopic mass. By monitoring the damping of the TDPAC precession not associated with a bound defect, the author observed release of untrapped interstitial H from the lattice. These experiments give a consistent, microscopic picture of H diffusion and release from Ni. The use of BaF{sub 2} scintillators allows for an eightfold improvement in TDPAC time resolution. This makes possible experiments in systems previously inaccessible due to large precessional frequencies. The author demonstrates the utility of BaF{sub 2} in several examples, including {sup 100}RhNi, {sup 99}TcFe, {sup 101}RuFe, {sup 100}RhCo and {sup 100}RhFe, systems which had not been studied previously due to time resolution limitation. The Larmor frequency for {sup 100}RhFe, 5565 Mrad/s, is the highest frequency ever measured via TDPAC.
- Research Organization:
- Clark Univ., Worcester, MA (USA)
- OSTI ID:
- 5966437
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DEUTERIUM
DIFFUSION
GOLD
CRYSTAL DEFECTS
NICKEL
PERMEABILITY
PLATINUM
CADMIUM 111
DEFORMATION
DOPED MATERIALS
HYDROGEN
INDIUM 111
PERTURBED ANGULAR CORRELATION
TEMPERATURE DEPENDENCE
TRAPPING
USES
VACANCIES
ANGULAR CORRELATION
BETA DECAY RADIOISOTOPES
CADMIUM ISOTOPES
CORRELATIONS
CRYSTAL STRUCTURE
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
HYDROGEN ISOTOPES
INDIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
METALS
MINUTES LIVING RADIOISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PLATINUM METALS
POINT DEFECTS
RADIOISOTOPES
STABLE ISOTOPES
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties