High entropy metallic glasses, what does it mean?
We performed calorimetric measurements on 30 bulk metallic glasses, each differing in their mixing entropies Δ S mix. On this basis, the excess entropies Δ S and excess enthalpies Δ H of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy Δ S...
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Veröffentlicht in: | Applied physics letters 2024-04, Vol.124 (15) |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We performed calorimetric measurements on 30 bulk metallic glasses, each differing in their mixing entropies
Δ
S
mix. On this basis, the excess entropies
Δ
S and excess enthalpies
Δ
H of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy
Δ
S on the average decreases with increasing mixing entropy
Δ
S
mix. This means that the so-called “high-entropy metallic glasses” (i.e., the glasses having high
Δ
S
mix) actually constitute glasses with low excess entropy
Δ
S. We predict that such glasses should have reduced relaxation ability. We also found that the excess enthalpy
Δ
H of glass linearly increases with its excess entropy
Δ
S, in line with a general thermodynamic estimate. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/5.0199955 |