We investigated the compressional behavior of i-AlCuFe quasicrystal using diamond anvil cell under quasi-hydrostatic conditions by in situ angle-dispersive X-ray powder diffraction measurements (in both compression and decompression) up to 76 GPa at ambient temperature using neon as pressure medium. These data were compared with those collected up to 104 GPa using KCl as pressure medium available in literature. In general, both sets of data indicate that individual d-spacing shows a continuous decrease with pressure with no drastic changes associated to structural phase transformations or amorphization. The d/d₀, where d₀ is the d-spacing at ambient pressure, showed a general isotropic compression behavior. The zero-pressure bulk modulus and its pressure derivative were calculated fitting the volume data to both the Murnaghan- and Birch-Murnaghan equation of state models. Results from this study extend our knowledge on the stability of icosahedrite at very high pressure and reinforce the evidence that natural quasicrystals formed during a shock event in asteroidal collisions and survived for eons in the history of the Solar System.

我们在室温下使用氖气作为压力介质，通过原位角分散X射线粉末衍射测量（压缩和解压缩）高达76 GPa，研究了在准静压条件下使用金刚石砧盒的i-AlCuFe准晶体的压缩行为。 。将这些数据与文献中使用KCl作为压力介质收集的高达104 GPa的数据进行比较。通常，两组数据均表明，各个d间距随压力不断减小，而没有与结构相变或非晶化相关的急剧变化。的d / d ₀，其中d ₀是d-在环境压力下的间距显示出一般的各向同性压缩行为。通过将体积数据与状态模型的Murnaghan-和Birch-Murnaghan方程拟合，计算出零压力体积模量及其压力导数。这项研究的结果扩展了我们对二十面体在非常高的压力下的稳定性的认识，并强化了证据表明，在小行星碰撞的冲击事件中，天然准晶体在太阳系的历史中得以生存。