Viscous flow behavior of four iron-containing silicates with alumina, effects of composition and oxidation condition.

Lisa Klein, B. V. Fasano, J. M. Wu

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Abstract

The viscosity of four Fe-containing silicates with alumina was measured under oxidizing and reducing conditions over the 450o- 700oC range. Initially, the compositions contain approx 2, 5, 10 and 20 mol.% of trivalent metal oxide. The viscosities of compositions with approximately equimolar Fe3+ and Al3+ are compared with those determined for compositions with trivalent cation all Fe or all Al. Then the batch composition calculated to replace one half of the Fe3+ by Al3+ under oxidizing conditions is corrected for the divalent iron present under mildly reducing conditions in forming gas (95% N2-5% H2) and strongly reducing conditions with C. In general, the viscosity measured in air was higher than the viscosity measured in forming gas with or without carbon for a given T and composition. The glasses prepared under oxidizing conditions had Fe2+/Fe total ratios <0.25 and those prepared under reducing conditions had Fe2+/Fe total ratios between 0.27 and 0.91. The viscosities for these glasses can be represented by a Vogel-Fulcher relation for each of the three oxidation conditions.-P.Br.

Original languageEnglish (US)
Pages (from-to)A880-A886
JournalJournal of Geophysical Research
Volume88
Issue numberSupplement
DOIs
StatePublished - Jan 1 1983

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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