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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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Metal-Organic Crystallized Glasses: Microstructure Formation and Their Properties.

Soracha Kosasang1,2, Nattapol Ma2, David L Christensen3

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.

Journal of the American Chemical Society
|September 5, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed novel metal-organic crystallized glasses (MOCGs) by partially crystallizing metal-organic framework (MOF) glasses. These MOCGs exhibit tunable properties like enhanced dielectric constants, opening new material possibilities.

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Chemistry

Background:

  • Glass-ceramics offer unique properties through controlled partial crystallization.
  • This approach has historically been confined to inorganic glass systems.
  • Metal-organic frameworks (MOFs) present a new class of amorphous materials for glass-ceramic development.

Purpose of the Study:

  • To introduce and characterize metal-organic crystallized glasses (MOCGs).
  • To investigate the influence of annealing on crystallinity and properties of MOF glasses.
  • To explore the potential for tuning dielectric and conductive properties in MOCGs.

Main Methods:

  • Preparation of 2D Cd(H2PO4)2(1,2,4-triazole)2-based MOF glasses.
  • Controlled annealing above the glass transition temperature (Tg) to induce partial crystallization.
  • Characterization of MOCGs using techniques to determine crystallinity, crystallite size, micromechanical properties, dielectric constants, and proton conductivity.
  • Exploration of mixed-metal MOF glass systems for solid solution formation.

Main Results:

  • Successfully fabricated MOCGs by controlling crystallization in MOF glasses.
  • Demonstrated tunable micromechanical properties, dielectric constants, and proton conductivities via annealing.
  • Achieved a 15% crystalline MOCG with a dielectric constant 10x higher than parent glass/crystals.
  • Extended the concept to mixed-metal systems, showing solid solution formation during annealing.

Conclusions:

  • Metal-organic crystallized glasses (MOCGs) represent a new class of functional materials.
  • Partial crystallization of MOF glasses provides a pathway to engineer material properties.
  • MOCGs offer significant potential for applications requiring high dielectric constants and tailored conductivity.