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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Phase separation in mullite-composition glass.

Stephen K Wilke1,2, Chris J Benmore3, Jan Ilavsky3

  • 1Materials Development, Inc., Evanston, IL, 60202, USA. swilke@matsdev.com.

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|October 21, 2022
PubMed
Summary
This summary is machine-generated.

Researchers studied mullite (AS60) glass by supercooling it. They discovered a metastable liquid-liquid unmixing, creating a two-phase glass with distinct aluminosilicate compositions for advanced material applications.

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Area of Science:

  • Materials Science
  • Glass Science
  • Geochemistry

Background:

  • Aluminosilicates (AS) are crucial in materials science, geology, and planetary science.
  • Glassy aluminosilicates are vital for technologies like displays, waveguides, and lasers.
  • The nonequilibrium behavior of mullite (AS60) remains poorly understood.

Purpose of the Study:

  • To investigate the nonequilibrium behavior of mullite-composition liquid.
  • To explore liquid-liquid unmixing in deeply supercooled aluminosilicate melts.
  • To characterize the resulting metastable phases and their properties.

Main Methods:

  • Deep supercooling of mullite-composition liquid using aerodynamic levitation.
  • X-ray scattering measurements to analyze the structure of the resulting glass.
  • Extrapolation and analysis of phase compositions and network structures.

Main Results:

  • Observed metastable liquid-liquid unmixing in supercooled mullite.
  • Formation of a transparent two-phase glass composed of nanoscale AS7 and AS62 phases.
  • AS7 phase resembles silica with minor aluminum substitution; AS62 features a highly polymerized AlO(x) network.

Conclusions:

  • The study reveals a novel unmixing pathway for mullite under deep supercooling.
  • The distinct AS7 and AS62 phases exhibit unique structural characteristics.
  • The polymerization of the AS62 network and composite morphology contribute to glass toughening.