Melting entropy and its connection to kinetic fragility in glass forming materials

Melting entropy and its connection to kinetic fragility in glass forming materials
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玻璃成型材料的熔化熵及其与动力学脆性的关系

DOI:
10.1016/j.jallcom.2016.11.255
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发表时间:
2017-03
影响因子:
6.2
通讯作者:
Li-Min Wang
Li-Min Wang
中科院分区:
材料科学2区
文献类型:
--
作者:
Pengfei Li;Peng Gao;Yingdan Liu;Li-Min Wang

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液体动力学与热力学的联系被证明有助于理解液体的玻璃化转变。本文研究了各种材料的熔化熵Δ Sm,着重讨论了它与动力学脆性的关系。测定了振动熵Δ Svib-ex/ΔSmis,并给出了ΔSvib-ex/Δ Smis比值与脆性的关系。该关联式基本上再现了在玻璃化转变温度Tg下测定的结果,表明ΔSvib-ex/Δ Sm从Tgup到熔点Tm的缓慢变化。ΔSvib-ex/ΔSmis还发现与离子晶体的离子性有关,与金属的Tm有关。
The connections of liquid dynamics to thermodynamics are proven to facilitate understanding the glass transition in liquids. Here, we investigated the melting entropies ΔSmof various materials with the emphasis on its relation to kinetic fragility. The vibrational entropy ΔSvib-exin ΔSmis determined and, a correlation between the ratio of ΔSvib-ex/ΔSmand fragility is shown. The correlation basically reproduces the results determined at glass transition temperatures,Tg, showing the sluggish variation of ΔSvib-ex/ΔSmfromTgup to the melting pointTm. ΔSvib-ex/ΔSmis also found to be related to the ionicity for ionic crystals and toTmfor metals.
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