Ring compaction as a mechanism of densification in amorphous silica

Ring compaction as a mechanism of densification in amorphous silica
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环压作为无定形二氧化硅致密化的机制

DOI:
10.1103/physrevb.107.144203
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发表时间:
2023
期刊:
影响因子:
3.7
通讯作者:
Kohara Shinji
Kohara Shinji
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Salmon Philip S.;Zeidler Anita;Shiga Motoki;Onodera Yohei;Kohara Shinji

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用中子和X射线衍射法研究了永久致密化二氧化硅玻璃的结构,并制作了再现衍射结果的原子模型。重点放在源于环的形成的中等长度标度上的有序的性质,其中是环内的Si或O原子的数量。致密化过程对这种有序性有很大的影响,从测量的结构因子中第一个尖锐衍射峰(FSDP)的显著变化可以看出这一点。没有发现环尺寸分布与FSDP的位置和形状的明确和系统的依赖关系,即环统计数据没有直接编码成该峰的形式。相反,玻璃致密化的一个重要贡献来自环的致密化,这是一个由环的回转半径和寿命来量化的度量标准。因此,我们发现并量化了非晶态材料中的一个关键致密化机制。
The structure of permanently densified silica glass is investigated by neutron and x-ray diffraction, and by the production of atomistic models that reproduce the diffraction results. The focus is on the nature of the ordering on an intermediate length scale that originates from the formation of-rings, whereis the number of Si or O atoms within a ring. The densification process has a large effect on this ordering, as identified by pronounced changes to the first sharp diffraction peak (FSDP) in the measured structure factors. A clear and systematic dependence of the distribution of ring sizes on the position and shape of the FSDP could not be found, i.e., the ring statistics are not directly encoded into the form of this peak. Instead, a significant contribution to the glass densification originates from compaction of the-rings, a metric that is quantified by the radius of gyration and lifetime of the rings. We thereby uncover and quantify a key densification mechanism in amorphous materials.
二维原子网络中的持久同源性。
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