GexSe90-xSb10硫系玻璃的热力学特性和动力学脆性研究*

doi:10.11900/0412.1961.2015.00072

金属学报

2015, Vol. 51

Issue (11): 1384-1390 DOI: 10.11900/0412.1961.2015.00072

本期目录 | 过刊浏览

Ge_xSe₉₀_-_xSb₁₀硫系玻璃的热力学特性和动力学脆性研究^*

李姣姣,坚增运(

),朱满,许军锋,常芳娥,相敏

STUDY ON THERMODYNAMIC PROPERTIES AND KINETICS FRAGILITY OF Ge_xSe₉₀_-_xSb₁₀ CHALCOGENIDE GLASSES

Jiaojiao LI,Zengyun JIAN,Man ZHU,Junfeng XU,Fang'e CHANG,Min XIANG

School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021

引用本文:

李姣姣,坚增运,朱满,许军锋,常芳娥,相敏. Ge_xSe₉₀_-_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.
Jiaojiao LI, Zengyun JIAN, Man ZHU, Junfeng XU, Fang'e CHANG, Min XIANG. STUDY ON THERMODYNAMIC PROPERTIES AND KINETICS FRAGILITY OF Ge_xSe₉₀_-_xSb₁₀ CHALCOGENIDE GLASSES[J]. Acta Metall Sin, 2015, 51(11): 1384-1390.

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摘要:

采用DSC对熔融-淬冷法制备的Ge_xSe₉₀_-_xSb₁₀ (x=20, 23, 25, 30)玻璃及其晶体的性质进行了研究, 获得了Ge_xSe₉₀_-_xSb₁₀玻璃在不同加热速率下的玻璃化转变温度T_g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Ge_xSe₉₀_-_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T_K (Kauzmann温度)及动力学脆性参数m. 结果表明, Ge_xSe₉₀_-_xSb₁₀的T_g, 玻璃与晶体的比热容和熵均随着升温速率的增加而增大. T_g和T₀随Ge含量的增加呈现先增大后减小的变化规律, T_K随Ge含量的增加呈现线性增大的规律. Ge_xSe₉₀_-_xSb₁₀玻璃的m, T_g/T_K, T_g/T_m和T_g/T₀分别为20.7~23.2, 1.183~1.352, 0.678~0.742和1.006~1.019. Ge_xSe₉₀_-_xSb₁₀玻璃的m均小于30, T_g/T_K均大于1.1, 说明其为典型的“强”熔体; T_g/T_m均大于2/3, 说明其玻璃化形成能力比较强.

关键词 ： Ge_xSe₉₀_-_xSb₁₀玻璃, 玻璃化转变温度, 比热容, 动力学脆性

Abstract：

The properties of the glasses and crystals of Ge_xSe₉₀_-_xSb₁₀ (x=20, 23, 25, 30) prepared with melt quenching method have been analyzed by DSC. The glass transition temperature (T_g) of Ge_xSe₉₀_-_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 (T_K) (Kauzmann temperature) and the kinetic fragility index (m) of Ge_xSe₉₀_-_xSb₁₀ glasses have been determined. It is found that T_g, the specific heat capacity and the entropy increase with increasing the heating rate. T_g and T₀ first increase and then decrease with increasing the Ge content, while T_K increases linearly with the increase of Ge content. The m, T_g/T_K, T_g/T_m and T_g/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 Ge_xSe₉₀_-_xSb₁₀ glass in this work, its m is smaller than 30 and T_g/T_K is larger than 1.1, which means that the Ge_xSe₉₀_-_xSb₁₀ glass should be considered as a strong melt. The value of T_g/T_m is larger than 2/3, which indicates that amorphous Ge_xSe₉₀_-_xSb₁₀ can be formed easily.

Key words： Ge_xSe₉₀_-_xSb₁₀ glass glass transition temperature specific heat capacity kinetic fragility

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

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00072 或 https://www.ams.org.cn/CN/Y2015/V51/I11/1384

图1 GexSe90-xSb10 (x=20, 23, 25, 30)玻璃的XRD谱

图2 GexSe90-xSb10硫系玻璃在不同升温速率下的DSC曲线

图3 GexSe90-xSb10硫系玻璃升温速率随玻璃化转变温度的变化及Vogel-Fulcher拟合曲线

表1 GexSe90-xSb10过冷熔体及晶体比热容的拟合参数

图4 GexSe90-xSb10 (x=20, 23, 25, 30)试样比热容随温度的变化

图5 过冷Ge20Se70Sb10熔体态与其晶体的熵差

表2 GexSe90-xSb10硫系玻璃的特征温度与动力学参数

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[1]	贾婷婷,坚增运,许军锋,朱满,常芳娥. Ge₃₀Se₇₀硫系玻璃的特征温度和性能^*[J]. 金属学报, 2016, 52(6): 755-760.

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