Indexes of thermodynamic fragility show discrepancies with respect to kinetic ones for metallic glass formers (slope of viscosity at the glass transition, m, vs. reduced temperatures at which specific entropy values are obtained). On the other hand, the reduced span of the glass transition range scales well with m.
A correlation, recently reported, between melt strength/fragility and the elastic moduli of glassy materials (namely the ratio of the bulk to shear modulus) is actually not stringent. There is, however, the possibility of distinguishing among various types of glasses, e. g. inorganic, organic, metal-metal and metal-metalloid.
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