Portland State College. Department of Physics
Date of Award
Master of Science (M.S.) in Physics
1 online resource (47 leaves)
Precision measurements of the Mössbauer fraction of the 14.4 kev Fe⁵⁷ transition were made using the black, wide absorber technique. The Fe⁵⁷ was diffused, as a dilute Mössbauer impurity, into 99.995% purity single crystal chips of Pt, Pd and Cu. By comparing the Debye form of -ln f, corrected for anharmonicity, with our data, we extracted a high and low temperature Debye theta, as well as an anharmonicity coefficient, є, for the three materials. We estimated the accuracy of our data to be ± 1%. From the data we concluded that the Fe⁵⁷ in Cu has stronger force constants and is more anharmonic than pure Cu, while Fe⁵⁷ in Pt and Pd has smaller force constants and about the same anharmonicity as the pure host materials.
Nees, Wilbur Lee, "Precision measurements of the Mössbauer fraction of Fe⁵⁷ in Pt, Pd and Cu" (1968). Dissertations and Theses. Paper 17.