Accessing ultrastable glass via a bulk transformation.

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.