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Mössbauer effect study of the decagonal quasicrystal Al70Co15Ni15

We present a systematic 57Fe Mössbauer effect study in the temperature range between 5.3 and 298.2 K and in an external magnetic field of 9.0 T of a high-quality stable decagonal quasicrystal Al70Co15Ni14.9Fe0.1. The iron atoms are shown to be located in two distinct classes of sites. The values of the principal component of the electric field gradient tensor and the asymmetry parameter at these sites are, respectively, −1.901(61) × 1021 V m−2, 0.96(12) and −3.927(52) × 1021 V m−2, 0.27(9). The average quadrupole splitting decreases with temperature as T3/2. The vibrations of the Fe atoms are well described by a Debye model, with the Debye temperature of 546(9) K.