Enhanced plasticity of silica glass at high pressure
Enhanced plasticity of silica glass at high pressure
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增强石英玻璃在高压下的可塑性
DOI：
10.1103/physrevb.91.014106
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发表时间：
2015
影响因子：
3.7
通讯作者：
and T. Sato
中科院分区：
文献类型：
--
作者：
D. Wakabayashi;N. Funamori;and T. Sato
我们分别用原位光学显微镜和X射线原位衍射技术测量了室温下在金刚石压砧中单轴压缩玻璃的剪切流动和残余结构各向异性。大的剪切流开始于，并持续至少高达20 GPa，在那里的宏观差异应变达到70%。剪切流动后的烧结样品处于完全致密化状态，仅在中程网络结构中显示出3%的大微观差异应变。这些现象可能是由于Si-O键的共价性和Si-O-Si键角随压力和应力的变化而发生的。
We have measured shear flow and residual structural anisotropy ofglass uniaxially compressed in a diamond-anvil cell at room temperature within situoptical-microscope andex situx-ray diffraction techniques, respectively. Large shear flow began atand continued at least up to 20 GPa, where the macroscopic differential strain reached 70%. Recovered samples after shear flow were in the fully densified state and showed a large microscopic differential strain of 3% only in the intermediate-range network structure. These phenomena may be attributable to the changes in the Si-O bond covalency and the Si-O-Si bond angle with pressure and stresses.