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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Updated: Jul 19, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Emerging exotic compositional order on approaching low-temperature equilibrium glasses.

Hua Tong1,2, Hajime Tanaka3,4

  • 1Department of Physics, University of Science and Technology of China, Hefei, 230026, China. huatong@ustc.edu.cn.

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|August 7, 2023
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Summary

Researchers discovered exotic compositional ordering in glass formers, challenging the ideal glass state. This unexpected ordering impacts structural relaxation dynamics, raising new questions about glass transitions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • The ultimate fate of glass formers upon cooling remains a fundamental problem.
  • Most glass formers crystallize or undergo phase separation, but a novel model system exhibits exceptional glass-forming ability.
  • This system was expected to approach the ideal glass state, a theoretical state of matter.

Purpose of the Study:

  • To investigate the low-temperature behavior of a novel glass-forming system with extraordinary properties.
  • To understand the nature of the glass transition in this system, particularly its deviation from conventional behavior.
  • To explore the impact of any observed ordering on the system's dynamics.

Main Methods:

  • Utilized a particle-size swap method to study a model glass-forming system.
  • Analyzed the system's structure and dynamics at low temperatures.
  • Employed advanced characterization techniques to probe compositional ordering.

Main Results:

  • Discovered exotic compositional order, characterized by network-like structures of small-large particle connections and patches of medium-sized particles.
  • Observed that the glass transition is accompanied by this unconventional ordering, which is not accessible through standard structural or thermodynamic analyses.
  • Found that this exotic compositional ordering significantly influences structural relaxation dynamics.

Conclusions:

  • The glass transition in this system is unexpectedly linked to exotic compositional ordering.
  • This ordering presents a new paradigm for understanding glass transitions, moving beyond traditional structural and thermodynamic perspectives.
  • Further research is needed to fully elucidate the role of unconventional structural ordering in glass science.