Correlation between superheated liquid fragility and potential energy landscape in Gd-and Pr-based glass-forming alloys  

作　　者：GUO Jing BIAN XiuFang LI XueLian WANG CaiDong 

机构地区：[1]Key Laboratory of Liquid Structure and Heredity of Materials,Ministry of Education,Shandong University,Jinan 250061,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2008年第4期387-393,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Basic Research Program of China (973 Program) (Grant No. 2007CB613901);the National Natural Science Foundation of China (Grant No. 50231040);the Natural Science Foundation of Shandong Province of China (Grant No. Z2004F02);the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20050422024)

摘　　要：The kinetic viscosities of superheated liquids on the Gd-based bulk glass-forming alloys are measured by an oscillating viscometer in a high vacuum atmosphere. According to the viscosity data,the parameters of superheated liquid fragility,M,are calculated. Based on the values of M in Gd-and Pr-based (cited from the lit-erature) glass-forming alloys,we find that there is a linear correlation between M and the absolute value of mixing enthalpy,|ΔHmix|,in an alloy system with the same base element,and the larger M,the smaller |ΔHmix|. The alloy with larger M exhibits the larger height of energy barriers separating the minima on the potential energy landscape.The kinetic viscosities of superheated liquids on the Gd-based bulk glass-forming alloys are measured by an oscillating viscometer in a high vacuum atmosphere. According to the viscosity data,the parameters of superheated liquid fragility,M,are calculated. Based on the values of M in Gd-and Pr-based (cited from the lit-erature) glass-forming alloys,we find that there is a linear correlation between M and the absolute value of mixing enthalpy,|ΔHmix|,in an alloy system with the same base element,and the larger M,the smaller |ΔHmix|. The alloy with larger M exhibits the larger height of energy barriers separating the minima on the potential energy landscape.

关 键 词：GLASS-FORMING alloy superheated liquid FRAGILITY POTENTIAL energy LANDSCAPE 

分 类 号：O482[理学—固体物理]