Abstract
A comparison is made between various models which predict the ability to form an amorphous phase with a relatively high crystallization temperature by rapid quenching or vapour deposition. These models are compared with recent experimental information. It is demonstrated that the effect of atomic size alone is not sufficient to describe the range of formation of amorphous phases. The crystal structure of the constituent elements must also be taken into account. The structural stability is correlated with the average number of valence electrons per atom Z ̄ . Easy amorphous phase formation is expected for those values of Z ̄ where structural stability is at a minimum. The comparison with experimental results suggests that the relative weight of the structural stability is different for 3d, 4d and 5d transition metal series.
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