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arXiv 2403.20115cond-mat.dis-nn
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高熵金属玻璃,这意味着什么?

High entropy metallic glasses, what does it mean?

G. V. Afonin, J. C. Qiao, A. S. Makarov, R. A. Konchakov, E. V. Goncharova, N. P. Kobelev, V. A. Khonik

AI总结:

本文通过量热测量30种块体金属玻璃,发现高混合熵金属玻璃反而具有低过剩熵,并预测其弛豫能力降低,同时揭示过剩焓与过剩熵呈线性关系。

摘要:

我们对30种混合熵ΔSmix不同的块体金属玻璃进行了量热测量。在此基础上,计算了玻璃相对于其母相晶态的过剩熵ΔS和过剩焓ΔH。研究发现,平均而言,过剩熵ΔS随着混合熵ΔSmix的增加而降低。这意味着所谓的“高熵金属玻璃”(即具有高ΔSmix的玻璃)实际上构成了具有低过剩熵ΔS的玻璃。我们预测这类玻璃应具有降低的弛豫能力。我们还发现,玻璃的过剩焓ΔH随其过剩熵ΔS线性增加,这与一般热力学估计一致。

英文摘要:

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

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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