Nuclear quadrupole interactions of 111In/Cd solute atoms in a series of rare-earth palladium alloys

  title={Nuclear quadrupole interactions of 111In/Cd solute atoms in a series of rare-earth palladium alloys},
  author={Qiaoming Wang and Gary S. Collins},
  journal={Hyperfine Interactions},
Nuclear quadrupole interactions were measured at 111In/Cd probe atoms in rare-earth palladium phases RPd3 having the L12 structure using the technique of perturbed angular correlation of gamma rays (PAC). Measurements were made for pairs of samples having compositions of the Pd-poorer and Pd-rich boundaries of the RPd3 phase fields, typically 75 and 78 at.% Pd. Two signals were detected in most phases, corresponding to probe atoms on cubic R- and non-cubic Pd-sublattices. Site preferences of… Expand

Figures from this paper

Impurity Diffusion in Highly-Ordered Intermetallic Compounds Studied by Nuclear Quadrupole Interactions
Diffusion of impurity atoms depends on the sublattices occupied, active diffusion mechanisms, and jump frequencies to neighboring sites. The method of perturbed angular correlation of gamma raysExpand
Diffusion and Equilibration of Site-Preferences Following Transmutation of Tracer Atoms
Using the method of perturbed angular correlation of gamma rays, diffusional jump-frequencies of probe atoms can be measured through relaxation of the nuclear quadrupole interaction. This was firstExpand
Atom Motion in Solids Following Nuclear Transmutation
Following nuclear decay, a daughter atom in a solid will "stay in place" if the recoil energy is less than the threshold for displacement. At high temperature, it may subsequently undergo long-rangeExpand
Site occupation of indium and jump frequencies of cadmium in FeGa3
Perturbed angular correlation (PAC) measurements using the In-111 probe were carried out on FeGa3 as part of a broader investigation of indium site occupation and cadmium diffusion in intermetallicExpand
Indium-defect interactions in FCC and BCC metals studied using the modified embedded atom method
With the aim of developing a transferable potential set capable of predicting defect formation, defect association, and diffusion properties in a wide range of intermetallic compounds, the presentExpand
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH Proposal to the ISOLDE and Neutron Time-of-Flight Committee Direct Measurement of Self Diffusion Jump Rates in an Intermetallic Compound
Diffusion is of fundamental importance for processing metallic materials. This long range movement of atoms affects nucleation and growth, sintering, and homogenization in the formation of alloys andExpand
Vacancy encounter model for stochastically fluctuating electric field gradients in the Cu3Au crystal structure
ABSTRACT A class of experimental techniques known as hyperfine methods can be used to measure electric field gradients (EFGs) through the hyperfine interaction experienced by tracer nuclei. When EFGsExpand


Diffusion in Intermetallic Compounds Studied Using Nuclear Quadrupole Relaxation
The jump frequency of Cd tracer atoms was measured as a function of temperature in seven rare-earth tri-indide intermetallic compounds having the L12, or Cu3Au, structure. The frequency, proportionalExpand
Comparison of Jump Frequencies of 111In/Cd Tracer Atoms in Sn3R and In3R Phases Having the L12 Structure (R = Rare-Earth)
Measurements were made of jump frequencies of 111In/Cd tracer atoms on the Sn-sublattice in rare-earth tri-stannides having the L12 crystal structure via perturbed angular correlation spectroscopyExpand
Composition-driven changes in lattice sites occupied by indium solutes inNi2Al3phases
Lattice locations of dilute indium solute atoms in phases having the Ni2Al3 crystal structure were determined using the technique of perturbed angular correlations of g rays. Four sites, includingExpand
Jump Frequencies of Cd Tracer Atoms in L12 Lanthanide Gallides
Jump frequencies of Cd tracer atoms were measured in three lanthanide gallides having the L12 structure: DyGa3, ErGa3 and LuGa3. 111In/Cd impurity probe atoms were observed to occupy the non-cubicExpand
Change of diffusion mechanism with lattice parameter in the series of lanthanide indides having L12 structure.
These findings signal an unmistakable change in diffusion mechanism from the simple In-sublattice vacancy mechanism for heavy lanthanides to a B-vacancy mechanism for light lanthanide indides. Expand
Nonstoichiometry in line compounds
Phases having compositional fields narrower than about 1 at.% and appearing as lines in binary phase diagrams often are assumed to have properties independent of composition. That such an assumptionExpand
PAC Probes as Diffusion Tracers in Solids
Perturbed angular correlation (PAC) probe atoms have been used as tracers to study diffusion in solids. The method works for diffusion on a sublattice for which the point symmetry is noncubic and theExpand
Atom movement in In3La studied via nuclear quadrupole relaxation.
Jump frequencies of Cd tracer atoms in In3La were measured via nuclear quadrupole relaxation caused by stochastic reorientation of the electric field gradient using the method of perturbed angular correlation of gamma rays, ruling out a simple In-vacancy diffusion mechanism. Expand
Abstract Based on computerized pattern recognition of chemical bond parameters, a predictive list of unknown compounds of various crystal-type has been prepared. Some new rare earth-transition metalExpand
Temperature- and composition-driven changes in site occupation of indium solutes in Gd1+3xAl2-3x
Fractional concentrations of indium solutes at Gd sites and Al sites in the Laves phase Gd113xAl223x were measured for different temperatures and sample compositions using perturbed angularExpand