High-pressure elasticity of α-quartz:: Instability and ferroelastic transition
High-pressure elasticity of α-quartz:: Instability and ferroelastic transition
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DOI：
10.1103/physrevlett.84.3117
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发表时间：
2000-04-03
影响因子：
8.6
通讯作者：
Gillet, P
中科院分区：
文献类型：
--
作者：
Gregoryanz, E;Hemley, RJ;Gillet, P
在金刚石对顶砧装置中，用布里渊光谱法测量了α-石英单晶的弹性模量，其值大于20 GPa。弹性模量的行为表明，在石英高压相变是铁弹性质，并通过玻恩稳定性标准之一的软化的C-44驱动。弹性模量的趋势证实了理论预测，但存在重要差异，特别是关于B-i的幅度。石英I-II转变发生在模式完全软化和非晶化之前。
The single-crystal elastic moduli of alpha-quartz were measured to above 20 GPa in a diamond-anvil cell by Brillouin spectroscopy. The behavior of the elastic moduli indicates that the high-pressure phase transition in quartz is ferroelastic in nature and is driven by softening of C-44 through one of the Born stability criteria. The trends in elastic moduli confirm theoretical predictions, but there are important differences, particularly with respect to the magnitudes of the B-i. The quartz I-II transition occurs prior to complete softening of the mode and amorphization.