Crystallisation studies of RE2O3Al2O3SiO2 glasses under long heat-treatment conditions
Crystallisation studies of RE2O3Al2O3SiO2 glasses under long heat-treatment conditions
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DOI：
10.1016/j.jallcom.2016.07.267
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发表时间：
2016-12
影响因子：
6.2
通讯作者：
S. Ahmad;M. Herrmann;M. Mahmoud;H. Leiste;W. Lippmann;H. Seifert
中科院分区：
文献类型：
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作者：
S. Ahmad;M. Herrmann;M. Mahmoud;H. Leiste;W. Lippmann;H. Seifert
采用熔体急冷法制备了RE_2O_3单键Al_2O_3单键SiO_2（RE = Y，Nd，Yb，Dy，Ho和Sc）系统玻璃。制备的玻璃，其特征在于使用差示扫描量热法和差热分析，以确定其玻璃化转变温度，结晶温度，软化温度和比热。利用原位高温X射线粉末衍射研究了这些玻璃从室温到1200 °C的晶体生长行为。将玻璃在1200 °C下热处理50小时以分析晶体结构。进行X射线衍射研究，以找到这些热处理样品中的相分布。采用扫描电子显微镜结合能量色散分析进行定性和定量相分析。测定了玻璃的热膨胀系数、密度和折射率。结果发现，转变温度和晶体结构形态强烈依赖于稀土离子的类型。
Glasses in the RE2O3single bondAl2O3single bondSiO2(RE = Y, Nd, Yb, Dy, Ho and Sc) system were prepared using the melt-quench route. Prepared glasses were characterized using differential scanning calorimetry and differential thermal analyses to determine their glass transition temperatures, crystallisation temperatures, softening temperatures and specific heat. In-situ high temperature X-ray powder diffraction was used to study the crystals growth behaviour in these glasses from room temperature up to 1200 °C. Glasses were heat-treated at 1200 °C for 50 h to analyze the crystalline structures. X-ray diffraction studies were carried out to find the distribution of phases in these heat-treated samples. Qualitative and quantitative phase analyses were conducted using scanning electron microscopy combined with energy dispersive analysis. Moreover coefficients of thermal expansion, densities and refractive indices of these glasses were determined. It was found that transitions temperatures and crystalline structure morphology strongly depend on the type of rare-earth ions.