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The relationship between fragility, configurational entropy and the potential energy landscape of glass-forming liquids

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  • Srikanth Sastry

    (Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus)

Abstract

Glass is a microscopically disordered, solid form of matter that results when a fluid is cooled or compressed in such a manner that it does not crystallize. Almost all types of materials are capable of glass formation, including polymers, metal alloys and molten salts. Given such diversity, general principles by which different glass-forming materials can be systematically classified are invaluable. One such principle is the classification of glass-formers according to their fragility1. Fragility measures the rapidity with which a liquid's properties (such as viscosity) change as the glassy state is approached. Although the relationship between the fragility, configurational entropy and features of the energy landscape (the complicated dependence of energy on configuration) of a glass-former have been analysed previously2, a detailed understanding of the origins of fragility is lacking. Here I use simulations to analyse the relationship between fragility and quantitative measures of the energy landscape for a model liquid whose fragility depends on its bulk density. The results reveal that fragility depends on changes in the vibrational properties of individual energy minima in addition to their total number and spread in energy. A thermodynamic expression for fragility is derived, which is in quantitative agreement with kinetic fragilities obtained from the liquid's diffusivity.

Suggested Citation

  • Srikanth Sastry, 2001. "The relationship between fragility, configurational entropy and the potential energy landscape of glass-forming liquids," Nature, Nature, vol. 409(6817), pages 164-167, January.
    • Handle: RePEc:nat:nature:v:409:y:2001:i:6817:d:10.1038_35051524
    DOI: 10.1038/35051524
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    Cited by:

    1. Hengwei Luan & Xin Zhang & Hongyu Ding & Fei Zhang & J. H. Luan & Z. B. Jiao & Yi-Chieh Yang & Hengtong Bu & Ranbin Wang & Jialun Gu & Chunlin Shao & Qing Yu & Yang Shao & Qiaoshi Zeng & Na Chen & C. , 2022. "High-entropy induced a glass-to-glass transition in a metallic glass," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. C.N., Sachin & Joy, Ashwin, 2023. "Configurational entropy of self-propelled glass formers," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 626(C).

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