Relation of the Fragility of Metallic Glasses with the Mixing Entropy and Excess Entropy with Respect to the Maternal Crystal

The excess entropy ΔS with respect to the maternal crystal has been determined for 18 metallic glasses differing in the mixing entropy ΔS_mix. Using these data, thermodynamic fragility m_ΔS has been determined within the Adam–Gibbs model. It has been shown that m_ΔS increases with ΔS_mix but decreases with increasing ΔS, which reflects the degree of structural disorder in a glass. It has been concluded that the so-called “high-entropy glasses” (i.e., having high ΔS_mix) are indeed most ordered and their properties are characterized by the slowest relaxation.