Relations of the characteristic temperatures and fragility parameters in glass-forming metallic system

摘要

We treat the liquid-to-glass transition as a sequence of self-similar "smeared" ideal transitions emerging at characteristic temperatures T-0, T-g and T-c, and employ the fragility parameter m(g) for the classification of glass-forming liquids (strong or fragile). The data of characteristic temperatures and fragility parameters provided in the literature for several glass-forming metallic alloys and our previous experimental and calculated data of Al85Ni8Ce7 and Al85Ni10Ce5 are found to be in accord with the known equation T-g/T-0=m(g)/(m(g)-m(1)), with adjustable parameter m(1)=16+/-2. Combining equation T-c/T-g=(m(g)+m(2))/(m(g)-m(2)) with m(2)=7+/-1, the upper estimate T-g(2)/T-0 and the lower estimate (T-g(3)/T-0)(1/2) is introduced for the crossover temperature T-c. (C) 2004 Elsevier B.V. All rights reserved.