FE-57 MOSSBAUER-EFFECT STUDIES OF QUADRUPOLE SPLITTING DISTRIBUTIONS IN ICOSAHEDRAL AL-TM-FE QUASI-CRYSTALS

Room temperature57Fe Mössbauer effect spectra of several Al-TM-Fe icosahedral quasicrystals are reported. Results of fits to discrete sites and to various distributions of quadrupole splittings are presented. Mean isomer shifts, {Mathematical expression}, and quadrupole splittings, Δ, are shown to be insensitive to the fitting procedure used. Trends in {Mathematical expression} and {Mathematical expression} for the icosahedral phase may be indicative of a Hume-Rothery stabilization mechanism. © 1990 J.C. Baltzer A.G., Scientific Publishing Company.