Ergodicity breaking in strong and network-forming glassy systems
Ergodicity breaking in strong and network-forming glassy systems
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DOI：
10.1103/physrevb.79.172201
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发表时间：
2009-05-01
影响因子：
3.7
通讯作者：
Sacchetti, F.
中科院分区：
文献类型：
--
作者：
Caponi, S.;Zanatta, M.;Sacchetti, F.
分析了由弹性和准弹性中子散射实验得到的玻璃GeO2的非遍历因子f(Q)(T)与温度的关系。数据收集的温度范围很广，从玻璃相到玻璃化转变温度，再到过冷液体状态。尽管所研究的系统被归类为强玻璃的原型，但发现f(Q)(T)的温度和Q行为符合模耦合理论的一些预言。实验数据支持在网络形成的玻璃系统中也存在从遍历到非遍历转变的假设。
The temperature dependence of the nonergodicity factor of vitreous GeO2, f(q)(T), as deduced from elastic and quasielastic neutron scattering experiments, is analyzed. The data are collected in a wide range of temperatures from the glassy phase, up to the glass-transition temperature, and well into the undercooled liquid state. Notwithstanding the investigated system is classified as prototype of strong glass, it is found that the temperature and the q behavior of f(q)(T) follow some of the predictions of mode coupling theory. The experimental data support the hypothesis of the existence of an ergodic to nonergodic transition also in network-forming glassy systems.