Dynamical and quasistatic structural relaxation paths in Pd40Ni40P20 glass
Dynamical and quasistatic structural relaxation paths in Pd40Ni40P20 glass
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DOI：
10.1063/1.3266828
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发表时间：
2009-11
影响因子：
4
通讯作者：
A. Kahl;T. Koeppe;D. Bedorf;R. Richert;M. Lind;M. Demetriou;W. Johnson;W. Arnold;K. Samwer
中科院分区：
文献类型：
--
作者：
A. Kahl;T. Koeppe;D. Bedorf;R. Richert;M. Lind;M. Demetriou;W. Johnson;W. Arnold;K. Samwer
通过对Pd_（40）Ni_（40）P_（20）金属玻璃在不可能发生α弛豫的温度和时间下进行连续热处理，在每次热处理后通过非原位超声测量确定了低于玻璃转变的动态和准静态弛豫路径。动态弛豫路径与玻璃的非平衡势能态之间的跳跃相关，而准静态弛豫路径与朝向准平衡态的可逆β弛豫事件相关。这些准平衡状态与二次势能极小值内存在的固有能量最小的玻璃，从而支持的概念的子盆地/metabasin组织的势能景观。
By sequential heat treatment of a Pd_(40)Ni_(40)P_(20) metallic glass at temperatures and durations for which α-relaxation is not possible, dynamic, and quasistatic relaxation paths below the glass transition are identified via ex situ ultrasonic measurements following each heat treatment. The dynamic relaxation paths are associated with hopping between nonequilibrium potential energy states of the glass, while the quasistatic relaxation path is associated with reversible β-relaxation events toward quasiequilibrium states. These quasiequilibrium states are identified with secondary potential energy minima that exist within the inherent energy minimum of the glass, thereby supporting the concept of the sub-basin/metabasin organization of the potential-energy landscape.