Effects of rare earth oxides on viscosity, thermal expansion, and structure of alkali-free boro-aluminosilicate glass

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• 作者：Yansheng Hou 侯延升 ; Jian Yuan…
• 关键词：Key wordsviscosity ; structure ; boro ; aluminosilicate ; rare earth oxides
• 刊名：Journal of Wuhan University of Technology-Mater. Sci. Ed.
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：32
• 期：1
• 页码：58-62
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general;
• 出版者：Wuhan University of Technology
• ISSN：1993-0437
• 卷排序：32

文摘

Effects of rare earth oxides (Y₂O₃, La₂O₃, and Er₂O₃) on the viscosity, thermal expansion, and structure of alkali-free boro-aluminosilicate glasses were investigated by the rotating crucible viscometer, dilatometry and FT-IR absorption spectra. The results showed that the melting temperature of alkali-free boro-aluminosilicate glasses decreased from 1 697.55 to 1 662.59, 1 674.37 and 1 640.87 °C with the introduction of 1 mol% La₂O₃, Y₂O₃ and Er₂O₃, respectively. However, the glass transition temperature T_g, dilatometric softening temperature T_d and coefficient of thermal expansion of alkali-free boro-aluminosilicate glasses increased when adding the rare-earth oxides. At high temperatures, incorporating rare earth oxides into glass resulted in the peak at about 1 085 cm-1 towards lower wavenumber and the absorption band in the region of 850-1 260 cm-1 broader, which indicated that rare earths acted as network modifiers and increased the numbers of non-bridging oxygen in the glass melts. However, the rare earths had an opposite effect and accumulated the glass structure at low temperatures near T_g.