PAC (perturbed angular correlation) analysis of defect motion by Blume's stochastic model for I = 5/2 electric quadrupole interactions

Technical Report · Mon Jan 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/6135930· OSTI ID:6135930

Evenson, W E ^[1]; Gardner, J A; Wang, Ruiping ^[2]; Su, Han-Tzong ^[3]; McKale, A G ^[4]

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1. Brigham Young Univ., Provo, UT (USA). Dept. of Physics and Astronomy
2. Oregon State Univ., Corvallis, OR (USA). Dept. of Physics
3. National Cheng Kung Univ., Tainan (Taiwan)
4. Computer Curriculum Corp., Sunnyvale, CA (USA)

Using Blume's stochastic model and the approach of Winkler and Gerdau, we have computed-time-dependent effects on perturbed angular correlation (PAC) spectra due to defect motion in solids in the case of I = (5/2) electric quadrupole interactions. We report detailed analysis for a family of simple models: XYZ + Z'' models, in which the symmetry axis of an axial efg is allowed to fluctuate among orientations along x, y, and z axes, and a static axial efg oriented along the z axis is added to the fluctuating efgs. When the static efg is zero, this model is termed the XYZ'' model. Approximate forms are given for G{sub 2}(t) in the slow and rapid fluctuation regimes, i.e. suitable for the low and high temperature regions, respectively. Where they adequately reflect the underlying physical processes, these expressions allow one to fit PAC data for a wide range of temperatures and dopant concentrations to a single model, thus increasing the uniqueness of the interpretation of the defect properties. Application of the models are given for zirconia and ceria ceramics. 14 refs.

• Research Organization: Oregon State Univ., Corvallis, OR (USA). Dept. of Physics
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG06-85ER45191
• OSTI ID: 6135930
• Report Number(s): DOE/ER/45191-16; ON: DE91005567
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CERAMICS
PERTURBED ANGULAR CORRELATION
CRYSTAL DEFECTS
MOTION
ZIRCONIUM OXIDES
CADMIUM 111
FLUCTUATIONS
HYPERFINE STRUCTURE
YTTRIUM OXIDES
ANGULAR CORRELATION
CADMIUM ISOTOPES
CHALCOGENIDES
CORRELATIONS
CRYSTAL STRUCTURE
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIOISOTOPES
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
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