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Inorganic Oxide Gels and Gel-Monoliths: Their Crystallization Behavior

  • Shyama P. Mukherjee
Part of the Materials Science Research book series (MSR, volume 17)

Abstract

The significance of kinetics in the ordering process in metal oxide gels and gel-monoliths during densification is discussed. Cry stallinity of TiO2 gels after different thermal treatments were examined by x-ray diffraction and electron diffraction techniques. The sequence of phase transformation was noncrystalline gel anatase + rutile. Crystallinity of gel powders and gel-monoliths of two compositions in the Na2O-Ba2O3-SiO2 system were examined after thermal treatment at different temperatures above the Tg. Results indicate that the crystallization rates are controlled by the composition and the catalytic activity of Na+ ions associated with hydroxy1 ions in rupturing the Si-O-Si bonds. Porous gel-monoliths are transformed into transparent monocrystalline glass by appropriate heat treatment just above Tg.

Keywords

Thermal Treatment Differential Thermal Analysis Crystallization Behavior Crystallization Rate Anatase Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Shyama P. Mukherjee
    • 1
  1. 1.Battelle’s Columbus LaboratoriesColumbusUSA

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