GexSe90-xSb10硫系玻璃的热力学特性和动力学脆性研究*
网络出版日期: 2015-08-13
基金资助
*国家重点基础研究发展计划项目2011CB610403, 国家自然科学基金项目51371137, 51071115, 51171136, 51301125 和51401156, 陕西省科技厅自然科学基金项目2012JM6010 和2014JM6225, 以及陕西省教育厅自然科学基金项目2013JK0907 资助
STUDY ON THERMODYNAMIC PROPERTIES AND KINETICS FRAGILITY OF GexSe90-xSb10 CHALCOGENIDE GLASSES
Online published: 2015-08-13
Supported by
Supported by National Basic Research Program of China (No.2011CB610403), National Natural Science Foundation of China (Nos.51371137, 51071115, 51171136, 51301125 and 51401156), Natural Science Basic Research Plan in Shaanxi Province of China (Nos.2012JM6010 and 2014JM6225) and Scientific Research Program Funded by Shaanxi Provincial Education Department (No.2013JK0907)
采用DSC对熔融-淬冷法制备的GexSe90-xSb10 (x=20, 23, 25, 30)玻璃及其晶体的性质进行了研究, 获得了GexSe90-xSb10玻璃在不同加热速率下的玻璃化转变温度Tg以及玻璃与晶体的比热容和熵随温度的变化关系, 在此基础上确定出了GexSe90-xSb10的动力学理想玻璃化转变温度T0, 热力学理想玻璃转变温度TK (Kauzmann温度)及动力学脆性参数m. 结果表明, GexSe90-xSb10的Tg, 玻璃与晶体的比热容和熵均随着升温速率的增加而增大. Tg和T0随Ge含量的增加呈现先增大后减小的变化规律, TK随Ge含量的增加呈现线性增大的规律. GexSe90-xSb10玻璃的m, Tg/TK, Tg/Tm和Tg/T0分别为20.7~23.2, 1.183~1.352, 0.678~0.742和1.006~1.019. GexSe90-xSb10玻璃的m均小于30, Tg/TK均大于1.1, 说明其为典型的“强”熔体; Tg/Tm均大于2/3, 说明其玻璃化形成能力比较强.
关键词： GexSe90-xSb10玻璃; 玻璃化转变温度; 比热容; 动力学脆性
李姣姣,坚增运,朱满,许军锋,常芳娥,相敏 . GexSe90-xSb10硫系玻璃的热力学特性和动力学脆性研究*[J]. 金属学报, 2015 , 51(11) : 1384 -1390 . DOI: 10.11900/0412.1961.2015.00072
The properties of the glasses and crystals of GexSe90-xSb10 (x=20, 23, 25, 30) prepared with melt quenching method have been analyzed by DSC. The glass transition temperature (Tg) of GexSe90-xSb10 glasses at different heating rates, the specific heat capacity and the entropy of the glasses and the crystals have been obtained. And on this basis, the kinetics ideal glass transition temperature (T0), the thermodynamics ideal glass transition temperature (TK) (Kauzmann temperature) and the kinetic fragility index (m) of GexSe90-xSb10 glasses have been determined. It is found that Tg, the specific heat capacity and the entropy increase with increasing the heating rate. Tg and T0 first increase and then decrease with increasing the Ge content, while TK increases linearly with the increase of Ge content. The m, Tg/TK, Tg/Tm and Tg/T0 are estimated to be 20.7~23.2, 1.183~1.352, 0.678~0.742 and 1.006~1.019, respectively. For each GexSe90-xSb10 glass in this work, its m is smaller than 30 and Tg/TK is larger than 1.1, which means that the GexSe90-xSb10 glass should be considered as a strong melt. The value of Tg/Tm is larger than 2/3, which indicates that amorphous GexSe90-xSb10 can be formed easily.
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