Khater, G. A. and Morsi, Morsi and Range, Klaus-Jürgen (2001) Effect of the nucleating agents Cr2O3 and LiF on crystallizing phases and microstructures of glass-ceramics prepared by using some industrial wastes. GLASS SCIENCE AND TECHNOLOGY-GLASTECHNISCHE BERICHTE, 74 (7). pp. 192-198. ISSN 0946-7475
Full text not available from this repository.Abstract
Glass-ceramics in the system diopside - anorthite - orthoclase were prepared using the waste known as the by-pass cement dust in the amount or 36% of the batch constituents. The effects of addition of the nucleating agents Cr2O3, LiF, and mixtures of them on the crystallizability, phase assemblages, and the resultant microstructures were investigated. Low concentration of Cr2O3 (0.5 wt%) causes volume crystallization and formation of fine-grained microstructures of microcline. anorthite and aluminous pyroxene. Higher concentrations of Cr2O3 favor formation of leucite and aluminous pyroxene and inhibit crystallization of anorthite. LiF causes the formation of microcline and its transformation into orthoclase. It also increases the crystallizability with the formation of non-uniform coarse-grained texture. A mixture of 0.5 % Cr2O3 and 1.5 % LiF causes a synergistic effect, where fine-grained microstructure is formed (due to Cr2O3) with orthoclase formation (due to LiF) in addition to aluminous pyroxene and anorthite. The effects of various Cr2O3 concentrations were discussed on the bases of the increased viscosity and separation of Cr2O3 and/or chromium-spinel phases, The effects of LiF were attributed to the role of fluorine ions in reducing the viscosity of the glasses. consequently facilitating crystallization of the structurally more complex silicate in addition to favoring reaching thermodynamic equilibrium.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALUMINOSILICATE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Klaus-Jürgen Range |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 Jan 2022 07:48 |
| Last Modified: | 11 Jan 2022 07:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41290 |
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