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Effect of MoO sub(3), Nd sub(2)O sub(3), and RuO sub(2) on the crystallization of soda-lime aluminoborosilicate glasses
The effect of adding Nd sub(2)O sub(3), MoO sub(3), and RuO sub(2) separately or simultaneously on the crystallization of a soda-lime aluminoborosilicate glass during cooling from the melt or glass heating was studied by DTA, XRD (at room and high temperature), SEM, Raman, and optical absorption. Nd...
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Published in: | Journal of materials science 2015-01, Vol.50 (1), p.219-241 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | The effect of adding Nd sub(2)O sub(3), MoO sub(3), and RuO sub(2) separately or simultaneously on the crystallization of a soda-lime aluminoborosilicate glass during cooling from the melt or glass heating was studied by DTA, XRD (at room and high temperature), SEM, Raman, and optical absorption. Nd sub(2)O sub(3) addition strongly reduces liquid-liquid phase separation and crystallization of calcium and sodium molybdates (CaMoO sub(4) (powellite) and Na sub(2)MoO sub(4)) in Mo-rich compositions as long as Nd super(3+) ions remain solubilized in the glassy network. This suggests that (MoO sub(4)) super(2-) entities and Nd super(3+) ions are close to each other in the glass structure (Nd super(3+) ions would prevent the clustering of molybdate entities). The effect of MoO sub(3) addition in Nd-rich compositions is more complex since an increase of the solubility of Nd sub(2)O sub(3) is observed, whereas the nucleation rate of an Nd-rich silicate apatite (Ca sub(2)Nd sub(8)(SiO sub(4)) sub(6)O sub(2)) in the bulk of the glass increases as soon as molybdates crystallized. The addition of RuO sub(2) has a nucleating effect on apatite crystallization in the bulk but not on molybdates crystallization. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-014-8581-9 |