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Related Concept Videos

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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High-temperature compression creates more relaxed densified silica glass structures than cold compression. This study reveals temperature

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Glass Science

Background:

  • Silica glass densification is achieved through various pressure and temperature paths.
  • Density is the primary macroscopic parameter for characterizing compressed silica.
  • Understanding structural modifications is crucial for tailoring silica glass properties.

Purpose of the Study:

  • To compare structural modifications in silica glass densified via different routes.
  • To investigate the influence of temperature and stress conditions on silica glass structure.
  • To correlate microstructural changes with macroscopic density.

Main Methods:

  • Preparation of densified silica glasses using cold and high-temperature (up to 1020 °C) compressions.
  • Characterization of densified silica glasses using micro-Raman spectroscopy.
  • Analysis of intertetrahedral angles and ring populations (3-membered rings).

Main Results:

  • Intertetrahedral angles decrease with compression; higher values observed in high-temperature compressed samples compared to cold-compressed ones.
  • The proportion of 3-membered rings increases with density in cold compression.
  • Elevated temperatures during compression reduce the population of 3-membered rings and result in more relaxed structures with lower internal stresses.

Conclusions:

  • Temperature significantly influences structural reorganization during silica glass densification.
  • High-temperature compression yields a more relaxed silica glass structure with reduced internal stresses compared to cold compression.
  • The study provides insights into the role of stress conditions (hydrostatic vs. non-hydrostatic) on glass structure and estimates average intertetrahedral angles and their distributions.