The glass transition behavior of La55A125-Ni10CU10 bulk metallic glass was investigated using elec-trical resistivity and differential-scanning calorimetry measurements. There are good agreements of the onset temperat...The glass transition behavior of La55A125-Ni10CU10 bulk metallic glass was investigated using elec-trical resistivity and differential-scanning calorimetry measurements. There are good agreements of the onset temperature （Tg-onset） and the end temperature （Tg-end） of the glass transition between the DSC curve and tempera-ture dependent electrical resistivity （TER） curve in the same heating rate. Kinetics of the glass transition is studied with the electrical resistivity data. The apparent activation energy of the glass transition （△Eg） is found to be 306.4 kJ.mol^-1. Fragility parameter D^＊ and VFT temper-ature To are 9.8 and 324.9 K, respectively.展开更多
Ultrafast differential scanning calorimetry(DSC) was employed to investigate the glass transition kinetics of As_2S_3 and As_2Se_3 . By using the Arrhenius method, a fragility index of～22 can be estimated in both As_...Ultrafast differential scanning calorimetry(DSC) was employed to investigate the glass transition kinetics of As_2S_3 and As_2Se_3 . By using the Arrhenius method, a fragility index of～22 can be estimated in both As_2S_3 and As_2Se_3 .However, when the scanning rate is more than 200 K·s^(-1), non-Arrhenius behavior can be observed in such "strong" liquids where the Vogel–Fulcher method is more accurate to describe the glass transition kinetics. The fragilities of As_2S_3 and As_2Se_3 glasses are thus extrapolated as 28.3±1.94 and 23.7±1.80, respectively. This indicates that, As_2Se_3 glass has a better structural stability and it is a better candidate for device applications.展开更多
Differences in the thermodynamic functions between the liquid and crystalline states of La-based bulk metallic glasses alloys were calculated with the specific heat capacity Cp and the fusion heat ΔHf,which we measur...Differences in the thermodynamic functions between the liquid and crystalline states of La-based bulk metallic glasses alloys were calculated with the specific heat capacity Cp and the fusion heat ΔHf,which we measured. Fragility indexes having different thermodynamic definitions were calculated from the temperature dependence of excess entropy ΔSliq-cry. It is ambiguous for La-based glass-forming liquid to evaluate fragility from the intercepts of ΔSliq-cry-temperature curves. We found that the thermodynamic fragility MΔS,denoted ΔS,decreases at the onset melting temperatures Tm rather than at glass transition temperatures Tg,and relates linearly with the kinetic fragility m. The correlations between thermodynamic fragility and kinetic fragility are discussed within the frameworks of the Adam-Gibbs relationship and potential energy landscape theory.展开更多
我们报导水 withSP2 潜力的玻璃转变的计算机模拟研究。使过程凉下来上的散开系数和过量熵的温度依赖是计算的。散开系数和过量熵在 160 K 显示出一个裂缝点，这被发现。我们的结果支持玻璃转变温度是 160 K 的观点。根据计算粘性，我...我们报导水 withSP2 潜力的玻璃转变的计算机模拟研究。使过程凉下来上的散开系数和过量熵的温度依赖是计算的。散开系数和过量熵在 160 K 显示出一个裂缝点，这被发现。我们的结果支持玻璃转变温度是 160 K 的观点。根据计算粘性，我们获得是 326 的水的一个脆弱索引，它比以前接受的价值大得多。展开更多
基金financially supported by the Fundamental Research Funds for the Central Universities(No.FRFTP-09-026B)the Program for Changjiang Scholars and Innovative Research Team in University,the Specialized Research Fund for the Doctoral Program of Higher Education(No.20100006110013)the National Natural Science Foundation of China(No.51010001)
文摘The glass transition behavior of La55A125-Ni10CU10 bulk metallic glass was investigated using elec-trical resistivity and differential-scanning calorimetry measurements. There are good agreements of the onset temperature （Tg-onset） and the end temperature （Tg-end） of the glass transition between the DSC curve and tempera-ture dependent electrical resistivity （TER） curve in the same heating rate. Kinetics of the glass transition is studied with the electrical resistivity data. The apparent activation energy of the glass transition （△Eg） is found to be 306.4 kJ.mol^-1. Fragility parameter D^＊ and VFT temper-ature To are 9.8 and 324.9 K, respectively.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61775111,61775109,and 51771216)the Natural Science Foundation of Zhejiang Province,China(Grant No.LR18E010002)+3 种基金the International Cooperation Project of Ningbo City(Grant No.2017D10009)the One Hundred Talents Program of Chinese Academy of Sciences3315 Innovation Team in Ningbo Citythe Magna Fund sponsored by K C Wong in Ningbo University,China
文摘Ultrafast differential scanning calorimetry(DSC) was employed to investigate the glass transition kinetics of As_2S_3 and As_2Se_3 . By using the Arrhenius method, a fragility index of～22 can be estimated in both As_2S_3 and As_2Se_3 .However, when the scanning rate is more than 200 K·s^(-1), non-Arrhenius behavior can be observed in such "strong" liquids where the Vogel–Fulcher method is more accurate to describe the glass transition kinetics. The fragilities of As_2S_3 and As_2Se_3 glasses are thus extrapolated as 28.3±1.94 and 23.7±1.80, respectively. This indicates that, As_2Se_3 glass has a better structural stability and it is a better candidate for device applications.
基金supported by the National Basic Research Program of China (2007CB613901)the National Natural Science Foundation of China (50871062 and 50831003)the Natural Science Foundation of Shandong Province (Z2008F08)
文摘Differences in the thermodynamic functions between the liquid and crystalline states of La-based bulk metallic glasses alloys were calculated with the specific heat capacity Cp and the fusion heat ΔHf,which we measured. Fragility indexes having different thermodynamic definitions were calculated from the temperature dependence of excess entropy ΔSliq-cry. It is ambiguous for La-based glass-forming liquid to evaluate fragility from the intercepts of ΔSliq-cry-temperature curves. We found that the thermodynamic fragility MΔS,denoted ΔS,decreases at the onset melting temperatures Tm rather than at glass transition temperatures Tg,and relates linearly with the kinetic fragility m. The correlations between thermodynamic fragility and kinetic fragility are discussed within the frameworks of the Adam-Gibbs relationship and potential energy landscape theory.
