Determination of complex-specific heat and fragility of sodium borate glasses by temperature-modulated DSC

被引：0
作者：
Yasuteru Fukawa
Yu Matsuda
Mitsuru Kawashima
Seiji Kojima
机构：
[1] University of Tsukuba,Graduate School of Pure and Applied Sciences
来源：
Journal of Thermal Analysis and Calorimetry | 2010年 / 99卷
关键词：
Complex-specific heat; Fragility; Dynamic glass transition; Sodium borate glasses; Temperature-modulated DSC (TMDSC); Structural relaxation;
D O I：
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学科分类号：
摘要：
The frequency dependences of the complex-specific heat of the sodium borate glasses, xNa2O·(100 − x)B2O3, where x denotes molar concentration of Na2O, have been investigated by temperature-modulated DSC. The temperature dependences of α-relaxation time have been analyzed in Angell plot, and the fragility index has been determined. The composition dependence of the fragility index has been discussed on the basis of the variations of the structural units of the borate network. The origin of the fragility of the borate system relates to the distribution of the coordination number of boron atom.
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页码：39 / 44
页数：5
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