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首页> 外文期刊>Physical review >Radial diffraction strength and elastic behavior of CaF_2 in low- and high-pressure phases
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Radial diffraction strength and elastic behavior of CaF_2 in low- and high-pressure phases

机译：CaF_2在低压和高压相中的径向衍射强度和弹性行为

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摘要

The radial-diffraction lattice behavior of CaF_2 was analyzed in its low-pressure (fluorite) and high-pressure phase up to 11.5 GPa using radial x-ray diffraction techniques in the diamond anvil cell. Between 3.5 and 7.1 GPa, fluorite develops a radial-diffraction strength of -0.8 GPa. The corresponding lattice anisotropy of the fluorite phase was measured to be equal to 0.73, in good agreement with previous Brillouin spectroscopy measurements. By 8.8 GPa, CaF_2 has undergone a phase transformation to its high-pressure (orthorhombic) phase, with a corresponding volume decrease of 10.4%. By 11.5 GPa, the volume drop between the low-pressure and high-pressure phase has increased to 11.5%. In addition, the high-pressure phase is found to withstand a significantly larger differential stress than the low-pressure fluorite phase, with a large degree of lattice anisotropy. In the maximum stress direction at 8.8 GPa, we observe a time-dependent evolution of the lattice parameters of CaF_2, indicating that the high-pressure structure is still undergoing deformation on time scales of hours after the phase boundary has been crossed.
机译：使用径向x射线衍射技术在金刚石砧座中分析了CaF_2在其低压（萤石）和高压相（最高11.5 GPa）中的径向衍射晶格行为。在3.5至7.1 GPa之间，萤石的径向衍射强度为-0.8 GPa。萤石相的相应晶格各向异性经测量等于0.73，与先前的布里渊光谱测量非常吻合。通过8.8 GPa，CaF_2已发生相转变为其高压（斜方）相，相应地体积减小了10.4％。在11.5 GPa时，低压和高压相之间的体积下降已增加至11.5％。另外，发现高压相比低压萤石相承受显着更大的压差，并且具有很大程度的晶格各向异性。在8.8 GPa的最大应力方向上，我们观察到CaF_2晶格参数随时间的变化，这表明高压结构在相界越过几小时后仍在变形。

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