Effects of Ag additive on structure and crystallization behaviors of As2(Se15Te85)3 glasses
Effects of Ag additive on structure and crystallization behaviors of As2(Se15Te85)3 glasses
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DOI：
10.1016/j.ceramint.2017.08.027
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发表时间：
2017-12
影响因子：
5.2
通讯作者：
Jianhua Zheng;Haiwei Yin;Lei Li;Yang Wang;Jie Wei;Guorong Chen
中科院分区：
文献类型：
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作者：
Jianhua Zheng;Haiwei Yin;Lei Li;Yang Wang;Jie Wei;Guorong Chen
本工作制备了As40-0.4x(Se15Te85)60-0.6xAgx(x=0，10，16.7，20，25at%)组成的玻璃样品。从玻璃密度和拉曼光谱随Ag添加的变化推断了玻璃的结构变化。用差示扫描量热法测定了其特征温度，评价了其抗结晶的热稳定性，并研究了非等温条件下的结晶动力学。所制备的玻璃样品在低(190°C)和高(260°C)析晶温度下进行热处理。X射线衍射图表明，从玻璃基质中析出的晶体是不含银的纯As-Te(Se)相。实验结果与拉曼光谱相吻合。相关的机理可以从Ag加入量对玻璃网络变化的双重化学作用来理解。
In this work, glass samples of compositions of As40-0.4x(Se15Te85)60-0.6xAgx(x = 0, 10, 16.7, 20, 25 at%) are prepared. The structural transformations of glasses are deduced from the variations of glass densities and Raman spectra with the addition of Ag. Differential scanning calorimetry is applied to determine the characteristic temperatures, evaluate the thermal stabilities against crystallization, and investigate the crystallization kinetics under non-isothermal conditions. Thermal treatment of the as-prepared glass samples is carried out at both low (190 °C) and high (260 °C) crystallization temperatures. X-ray diffraction patterns demonstrate that crystals precipitated from glass matrices are pure As-Te(Se) phases free of Ag. The results are consistent with the Raman spectra. The relevant mechanism can be understood based on the dual chemical role of the Ag addition on the variations of glass network.