High entropy metallic glasses, what does it mean?

Abstract

We performed calorimetric measurements on 30 bulk metallic glasses, each differing in their mixing entropies ΔSmix. On this basis, the excess entropies ΔS and excess enthalpies ΔH of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy ΔS on the average decreases with increasing mixing entropy ΔSmix. This means that the so-called “high-entropy metallic glasses” (i.e., the glasses having highΔSmix) actually constitute glasses with low excess entropy ΔS. We predict that such glasses should have reduced relaxation ability. We also found that the excess enthalpy ΔH of glass linearly increases with its excess entropy ΔS, in line with a general thermodynamic estimate.