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Accessing ultrastable glass via a bulk transformation.

Hengtong Bu1, Hengwei Luan1,2,3, Jingyi Kang1

  • 1School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

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Researchers created ultrastable glasses using a bulk glass-to-glass transition, enhancing density and stability. This new method offers a general approach for metallic glasses, overcoming limitations of previous surface-based techniques.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics

Background:

  • Ultrastable glasses are crucial for understanding glass transition and have technological importance.
  • Current methods primarily rely on surface-controlled physical vapor deposition, limiting scalability and introducing anisotropy.
  • Instability issues plague current glass materials and devices.

Purpose of the Study:

  • To demonstrate a novel method for producing ultrastable glasses via a bulk glass-to-glass transition.
  • To investigate the properties of ultrastable glasses produced by this new method.
  • To explore the general applicability of this method to metallic glasses.

Main Methods:

  • Inducing a glass-to-glass transition as a bulk transformation process.
  • Characterizing the density, thermodynamic, kinetic, and mechanical stability of the resulting glasses.
  • Analyzing the competition between glass-to-glass transition and crystallization in metallic glasses.

Main Results:

  • Successfully produced ultrastable glasses through a bulk glass-to-glass transition, avoiding size constraints and anisotropy.
  • Achieved a 2.3% enhancement in density, alongside significant improvements in thermodynamic, kinetic, and mechanical stability.
  • Established the general applicability of this method for metallic glasses by examining the transition and crystallization dynamics.

Conclusions:

  • The glass-to-glass transition offers a scalable and versatile route to ultrastable glasses, overcoming limitations of physical vapor deposition.
  • This approach significantly enhances glass properties and provides a pathway to resolve material instability issues.
  • The findings deepen the fundamental understanding of glass transitions and pave the way for broader applications of ultrastable glasses.