Stishovite formation at very low pressures in soda-lime glass
Stishovite formation at very low pressures in soda-lime glass
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在钠钙玻璃中极低压力下形成 Stishovite
DOI：
10.1016/j.scriptamat.2019.06.005
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发表时间：
2019
影响因子：
6
通讯作者：
Gupta, Vijay
中科院分区：
文献类型：
--
作者：
Pozuelo, Marta;Lefebvre, Joseph;Srivastava, Pratyush;Gupta, Vijay
我们首次表明，无定形钠钙玻璃经历多晶型转变，其致密的结晶stishovite相在只有~5 GPa的压力和室温下，通过单轴压缩的钠钙玻璃纳米柱的直径为500 nm，并观察后变形的支柱在透射电子显微镜下。这与最近的无定形熔融石英玻璃板的冲击压缩实验形成对比，该实验报告了stishovite形成的压力阈值为34 GPa。我们的研究结果支持最近的位错动力学模拟的W柱，这表明，小域尺寸作为一个代理高温，从而降低了压力阈值。
We show for the first time that amorphous soda-lime glass undergoes polymorphic transformation to its densest crystalline stishovite phase at only ~5 GPa of pressure and room temperature, by uniaxially compressing the soda-lime glass nanopillars of 500 nm diameter and observing the post-deformed pillars under transmission electron microscopy. This contrasts with the recent shock-compression experiments of amorphous fused silica glass plates which report a pressure threshold of 34 GPa for stishovite formation. Our findings support recent dislocation dynamics simulations on W pillars which show that small domain size acts as a proxy for high temperature, thereby reducing the pressure threshold.