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Origin of liquid fragility.

Chae Woo Ryu1, Takeshi Egami1,2,3

  • 1Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA.

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Summary
This summary is machine-generated.

Liquid fragility, a key property of glass-forming liquids, is directly linked to the medium-range order (MRO). This finding clarifies the origin of liquid fragility and its connection to atomic transport mechanisms.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Liquid fragility describes the steepness of viscosity change with temperature in glass-forming liquids.
  • Understanding its origin is crucial for both fundamental science and practical applications.
  • Current knowledge on the origins of liquid fragility remains incomplete.

Purpose of the Study:

  • To elucidate the fundamental origin of liquid fragility.
  • To establish a direct relationship between liquid fragility and the structural properties of liquids.
  • To provide insights into the mechanisms governing atomic transport in supercooled liquids.

Main Methods:

  • Analysis of the decay of the pair-distribution function to define medium-range order (MRO).
  • Evaluation of MRO using the first peak of the structure function from X-ray or neutron diffraction.
  • Correlating MRO with the cooperativity of atomic motion in supercooled liquids.

Main Results:

  • Liquid fragility is shown to be directly related to the structural coherence of medium-range order (MRO) in liquids.
  • MRO, quantifiable via diffraction methods, serves as a measure of atomic motion cooperativity.
  • A clear link is established between the macroscopic property of fragility and microscopic structural order.

Conclusions:

  • The study identifies the structural coherence of MRO as the origin of liquid fragility.
  • Findings offer a new perspective on atomic transport mechanisms in supercooled liquids.
  • This research bridges the understanding of liquid structure and dynamics.