MICROSTRUCTURAL OBSERVATIONS OF ALPHA-QUARTZ AMORPHIZATION
MICROSTRUCTURAL OBSERVATIONS OF ALPHA-QUARTZ AMORPHIZATION
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DOI：
10.1126/science.259.5095.666
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发表时间：
1993-01-29
期刊：
影响因子：
56.9
通讯作者：
VEBLEN, DR
中科院分区：
文献类型：
--
作者：
KINGMA, KJ;MEADE, C;VEBLEN, DR
固态非晶化是在越来越多的材料中观察到的一种转变。显微观察表明，α -石英的非晶化始于晶体学控制的平面缺陷的形成，随后在这些缺陷部位生长出非晶二氧化硅。石英在金刚石砧池中经过准流体静力和非流体静力压缩至40千兆帕斯卡和简单粉碎后，也发现了类似的转变微观结构。结果表明，静态和冲击高压实验、陨石撞击和构造变形对硅酸盐的固态非晶化具有共同的机制。总的来说，这些结果与最近提出的非晶化剪切不稳定模型是一致的。
Solid-state amorphization is a transformation that has been observed in a growing number of materials. Microscopic observations indicate that amorphization of alpha-quartz begins with formation of crystallographically controlled planar defects and is followed by growth of amorphous silicon dioxide at these defect sites. Similar transformation microstructures are found in quartz upon quasihydrostatic and nonhydrostatic compression in a diamond-anvil cell to 40 gigapascals and from simple comminution. The results suggest that there is a common mechanism for solid-state amorphization of silicates in static and shock high-pressure experiments, meteorite impact, and deformation by tectonic processes. In general, these results are consistent with recently proposed shear instability models of amorphization.