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Journal of Materials Science

, Volume 29, Issue 23, pp 6273–6280 | Cite as

Solubility, reactivity and nucleation effect of Cr2O3 in the CaO-MgO-Al2O3-SiO2 glassy system

  • L. Barbieri
  • C. Leonelli
  • T. Manfredini
  • G. C. Pellacani
  • C. Siligardi
  • E. Tondello
  • R. Bertoncello
Article

Abstract

The effect of Cr2O3 on some anorthite-diopside glass-ceramics has been investigated up to amounts of 5 mol%. The solubility in the glassy compositions analysed is total for the oxide, but for amounts higher than 0.5 mol%, an insoluble spinel form, MgCr2O4, precipitates. Ultraviolet-visible spectroscopy has proved to be the most sensitive technique to the presence of Cr(III) in a crystalline spinel site, followed by X-ray diffraction and scanning electron microscopy observations. Electron spin resonance and X-ray photoelectron spectroscopy techniques excluded any oxidation state, other than Cr3+. The influence of the transition cation on glass nucleation is that of an increasing bulk effect with chromium, and thus chromium-spinel, content. The magnesium content affects spinel formation, while heat treatments up to 1100 °C do not. The spinel formation influences the anorthite-diopside ratio in the glass-ceramic, with a large favour towards the pyroxene.

Keywords

Electron Spin Resonance Electron Spin Scanning Electron Microscopy Observation Electron Microscopy Observation Spectroscopy Technique 
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

© Chapman & Hall 1994

Authors and Affiliations

  • L. Barbieri
    • 1
  • C. Leonelli
    • 1
  • T. Manfredini
    • 1
  • G. C. Pellacani
    • 1
  • C. Siligardi
    • 1
  • E. Tondello
    • 2
  • R. Bertoncello
    • 2
  1. 1.Department of ChemistryModenaItaly
  2. 2.Department of Inorganic, Metallorganic and Analytical ChemistryPadovaItaly

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