Effect of ZnO, La₂O₃, and YF₃ on Crystallization and Rehological Behavior of Y₂O₃-Al₂O₃-SiO₂ Glass

Abstract

The effect of substitution La₂O₃ and YF₃ as network modifiers respectively for Y₂O₃, and ZnO as intermediate oxide for Al₂O₃ on crystallization and viscous behavior of Y₂O₃-Al₂O₃-SiO₂ glass was studied. La₂O₃ and YF₃ substitution for Y₂O₃ decreases the melting temperature of studied glass from 1 402 to 1 346 and 1 379 °C, and the activation energy of viscous flow decreases from 340 to 250 and 265 kJ/mol. Meanwhile, ZnO substitution for Al₂O₃ decreases the melting temperature to 1379 °C while increases the activation energy of viscous flow to 542 kJ/mol, due to their different role in glass structure. Substitution ZnO for Al₂O₃ refines and homogenizes the crystals size and lowers crystallinity because the nucleation and crystal growth are depressed by higher activation energy of crystallization and change of crystallization mechanism from bulk crystallization to surface crystallization. Replacement of Y₂O₃ by La₂O₃ and YF₃ respectively also decreases the crystallinity of Y₂O₃-Al₂O₃-SiO₂ glass ceramic due to competitive and hindering effect on the rearranged atoms, structural units and groups required by precipitated two crystals. Besides, y-Y₂Si₂O₇, precipitation of Y_4.67(SiO₄)₃O, ZnAl₂O₄, and Y₃Si₃O₁₀F were observed respectively due to incorporation of La₂O₃, ZnO, and YF₃.

Keywords

Y₂O₃ / aluminosilicate glass / crystallization / viscous activation energy

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