Characterization of Y2O3 and CeO2 doped SiO2-SrO-Na2O glasses

Q1 Materials Science

Biomedical Glasses Pub Date : 2015-01-30 DOI:10.1515/bglass-2015-0016

L. Placek, T. Keenan, F. Laffir, A. Coughlan, A. Wren

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引用次数: 3

Abstract

Abstract The structural effects of yttrium (Y) and cerium (Ce) are investigated when substituted for sodium (Na) in a 0.52SiO2–0.24SrO–(0.24−x)Na2O–xMO (where x = 0.08; MO = Y2O3 and CeO2) glass series. Network connectivity (NC) was calculated assuming both Y and Ce can act as a network modifier (NC = 2.2) or as a network former (NC up to 2.9). Thermal analysis showed an increase in glass transition temperature (Tg) with increasing Y and Ce content, Y causing the greater increase from the control (Con) at 493∘C to 8 mol% Y (HY) at 660∘C. Vickers hardness (HV) was not significantly different between glasses. 29Si Magic Angle Spinning-Nuclear Magnetic Resonance (MAS-NMR) did not show peak shift with addition of Y, however Ce produced peak broadening and a negative shift in ppm. The addition of 4 mol% Ce in the YCe and LCe glasses shifted the peak from Con at −81.3 ppm to −82.8 ppm and −82.7 ppm respectively; while the HCe glass produced a much broader peak and a shift to −84.8 ppm. High resolution X-ray Photoelectron Spectroscopy for the O 1s spectral line showed the ratio of bridging (BO) to non-bridging oxygens (NBO), BO:NBO,was altered,where Con had a ratio of 0.7, HY decreased to 0.4 and HCe to 0.5.

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Y2O3和CeO2掺杂SiO2-SrO-Na2O玻璃的表征

研究了在0.52SiO2-0.24SrO -(0.24−x) Na2O-xMO (x = 0.08;MO = Y2O3和CeO2)玻璃系列。网络连通性(NC)的计算假设Y和Ce都可以作为网络修饰符(NC = 2.2)或网络前身(NC高达2.9)。热分析显示，玻璃化转变温度(Tg)随Y和Ce含量的增加而增加，Y使493°C时的对照(Con)增加到660°C时的8mol % Y (HY)。维氏硬度(HV)在不同眼镜间无显著差异。随着Y的加入，si魔角自旋核磁共振(MAS-NMR)没有出现峰移，而Ce在ppm中出现峰增宽和负移。在YCe和LCe玻璃中添加4 mol%的Ce，使Con峰分别从−81.3 ppm变为−82.8 ppm和−82.7 ppm;而HCe玻璃产生了更宽的峰值，并移至- 84.8 ppm。O 1s谱线的高分辨率x射线光电子能谱显示，桥氧(BO)与非桥氧(NBO)之比BO:NBO发生了变化，其中Con的比值为0.7,HY降至0.4,HCe降至0.5。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomedical Glasses Materials Science-Surfaces, Coatings and Films

自引率

0.00%

发文量

审稿时长

17 weeks

期刊介绍： Biomedical Glasses is an international Open Access-only journal covering the field of glasses for biomedical applications. The scope of the journal covers the science and technology of glasses and glass-based materials intended for applications in medicine and dentistry. It includes: Chemistry, physics, structure, design and characterization of biomedical glasses Surface science and interactions of biomedical glasses with aqueous and biological media Modeling structure and reactivity of biomedical glasses and their interfaces Biocompatibility of biomedical glasses Processing of biomedical glasses to achieve specific forms and functionality Biomedical glass coatings and composites In vitro and in vivo evaluation of biomedical glasses Glasses and glass-ceramics in engineered regeneration of tissues and organs Glass-based devices for medical and dental applications Application of glasses and glass-ceramics in healthcare.