A study of quasi-crystalline Al–Fe alloys by Mössbauer-effect spectroscopy and diffraction techniques

Abstract

After an introduction to quasi crystals, special attention is paid to icosahedral Al 6 (Cr 0.7 Fe 0 . 3 ) and decagonal Al 7 (Mn 1−x Fe x ) 2 . These alloys have been studied with Mössbauer-effect spectroscopy and diffraction techniques. Isomer-shift and quadrupole-splitting data on the icosahedral alloys are successfully described with a Mackay cluster. The X-ray diffractogram of pure decagonal Al 7 (Mn 1−x Fe x ) 2 , x = 0 and 0.3, has been indexed with a basis-vector set that is closely related to the icosahedral set.