NMR and magnetic susceptibility study of the Ca100−xAlx metallic glass system

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Abstract
In order to investigate the atomic and electronic structures of the melt spun metallic glass system Ca100−xAlx (15≤x≤45 at. %), measurements of the 27Al NMR Knight shift and linewidth, as well as the magnetic susceptibility, have been carried out at room temperature. Spectra have been obtained for resonance frequencies ranging from 9 to 20 MHz and are characteristic of a convolution of a symmetric nuclear dipole‐dipole line and an asymmetric second order quadrupole line. Both the Knight shift and linewidth remain constant throughout the entire glassy regime providing evidence for some form of short range order in this system. An analysis of the magnetic susceptibility results indicates that estimates based on the free electron model are inadequate.