Pressure-driven transformation of the ordering in amorphous network-forming materials
Pressure-driven transformation of the ordering in amorphous network-forming materials
复制标题
非晶网络形成材料中有序化的压力驱动转变
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Salmon
中科院分区：
文献类型：
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作者：
A. Zeidler;P. Salmon
无序氧化物和硫属化物网络形成材料的结构的压力引起的变化进行了研究与测量的衍射图案的前三个峰的长度尺度。给定峰位置的密度依赖性不产生网络维数，与金属玻璃相反，金属玻璃的结果表明局部维数为~5/2的分形几何形状。对于氧化物，一个共同的关系被发现之间的中程有序，所描述的第一个尖锐的衍射峰的位置，和氧包装分数，一个参数，在驱动本地图案的配位数的变化中起着关键作用。因此，第一个尖锐的衍射峰可以用来测量拓扑变化何时可能发生，改变网络结构及其相关物理性质的事件。
The pressure-induced changes to the structure of disordered oxide and chalcogenide network-forming materials are investigated on the length scales associated with the first three peaks in measured diffraction patterns. The density dependence of a given peak position does not yield the network dimensionality, in contrast to metallic glasses where the results indicate a fractal geometry with a local dimensionality of ~5/2. For oxides, a common relation is found between the intermediate-range ordering, as described by the position of the first sharp diffraction peak, and the oxygen-packing fraction, a parameter that plays a key role in driving changes to the coordination number of local motifs. The first sharp diffraction peak can therefore be used to gauge when topological changes are likely to occur, events that transform network structures and their related physical properties.