Differential mobility and spatially heterogeneous dynamics of oxygen atoms in a supercooled glass-forming network liquid
Differential mobility and spatially heterogeneous dynamics of oxygen atoms in a supercooled glass-forming network liquid
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过冷玻璃形成网络液体中氧原子的微分迁移率和空间异质动力学
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
S. Sen
中科院分区：
文献类型：
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作者：
S. Sen
网状硅酸盐液体中氧原子的定点动力学 ext{K}}_{2} 外接{O-}93.6%{ 用高温（高达973 K）^{17}研究了在玻璃化转变区的外延{SiO}}_{2}） 核磁共振波谱分析。观察到桥接和非桥接氧环境之间的化学交换的时间尺度比剪切驰豫快几个数量级。然而，没有观察到显着的自我交换在这个时间尺度之间的桥接氧环境。这些结果的影响进行了讨论，在强网络液体的传输性能和玻璃化转变。
Site-specific dynamics of oxygen atoms in a network silicate liquid $(6.4%{ ext{K}}_{2} ext{O-}93.6%{ ext{SiO}}_{2})$ has been studied in the glass transition region using high-temperature (up to 973 K) $^{17} ext{O}$ nuclear-magnetic-resonance spectroscopy. Chemical exchange between bridging and nonbridging oxygen environments is observed at a timescale that is orders of magnitude faster than that of shear relaxation. However, no significant self-exchange is observed at this timescale between the bridging oxygen environments. Implications of these results are discussed in relation to transport properties and glass transition in strong network liquids.