Abstract
Rapidly solidified Ti-Ni-Fe-Si alloys are found to form a metastable phase with x-ray diffraction patterns which can be indexed to a structure with icosahedral symmetry. 57 Fe Mössbauer effect spectra show a negligible quadrupole splitting for the icosahedral phase. This observation, along with a comparison of the measured x-ray diffraction line intensities with calculated values, suggests a structure based on a decoration of a three-dimensional Penrose tiling, with transition-metal atoms in sites with local icosahedral symmetry. Magnetic susceptibility measurements show that a local moment of ∼0.2 μB forms on the Fe atom. These results are discussed in terms of possible local Fe environments.
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