Dependence of glass forming ability on liquid fragility: Thermodynamics versus kinetics

Dependence of glass forming ability on liquid fragility: Thermodynamics versus kinetics
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玻璃形成能力对液体脆性的依赖性:热力学与动力学

DOI:
10.1063/1.3506900
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发表时间:
2010-11
期刊:
Applied Physics Letters (SCI Impact factor: 3.554)
影响因子:
--
通讯作者:
Yongjun Tian
Yongjun Tian
中科院分区:
其他
文献类型:
--
作者:
Riping Liu;Li-Min Wang;Yongjun Tian

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通过热力学和动力学分析,研究了玻璃形成能力与液体脆性的关系。为了从热力学上解决玻璃形成过程中的脆性效应,给出了过冷液体与平衡晶体之间吉布斯自由能差的一般表达式。结果表明,热力学上增加脆性有利于玻璃的形成,与动力学上的脆性效应形成显著对比。比较了金属合金和分子同分异构体中玻璃形成能力与脆性的关系,并分别强调了玻璃形成的动力学和热力学。
The dependence of glass forming ability on liquid fragility is studied with thermodynamic and kinetic analyses. A general expression of the Gibbs free energy difference between an undercooled liquid and its equilibrium crystal is presented to address thermodynamically the fragility effect on glass formation. It is found that increasing fragility thermodynamically favors glass formation, remarkably contrasting with the fragility effect from the kinetic point of view. The dependences of glass forming ability on fragility in metallic alloys and molecular isomers are compared, and kinetics and thermodynamics of glass formation are, respectively, emphasized.
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