The high-pressure behavior of the natural MTN-type clathrasil chibaite was investigated with in situ single-crystal X-ray diffraction and Raman spectroscopy under hydrostatic pressures up to 10.3 GPa. The experiments were conducted in diamond-anvil cells using 4:1 methanol-ethanol mixture (ME), helium (He) and neon (Ne) as pressure-transmitting media. The pressure dependent unit-cell volumes of the room-pressure polymorph yield an isothermal bulk modulus K_T0 = 25.75 (19) GPa for the compression in the non-penetrating ME fluid. Due to the penetration of the Ne and He atoms into the cages of the framework, the crystal structure is significantly stiffened resulting in K_T0 = 42.5 (1.2) GPa (Ne) and K_T0 = 58 (2) GPa (He). Under the influence of pressure both the evolution of the Raman spectra and the change in cell metrics indicate a distortion of the lattice without leading to a complete pressure-induced amorphization, as observed for many comparable porous structures. Compressed in the non-penetrating ME, the cubic $Fd\overline{3}m$ framework of chibaite undergoes a first transformation step in the pressure range between 1.7 GPa and 2.2 GPa and a second one between 3.9 GPa and 4.3 GPa. The accompanied formation of crystal domains did not allow a reliable determination of the distorted crystal structures. The unit-cell parameters might suggest a monoclinic metric for pressures >1.7 GPa and a monoclinic or tetragonal metric for pressures >3.9 GPa. However, in some samples even the co-existence of crystal domains of a different degree of lattice distortions has been proved.

在高达10.3 GPa的静水压力下，通过原位单晶X射线衍射和拉曼光谱研究了天然MTN型笼形硅铁矾土的高压行为。实验是使用4：1甲醇-乙醇混合物（ME），氦气（He）和氖气（Ne）作为压力传递介质在金刚石-砧室中进行的。室温多晶型物的压力依赖性晶胞体积产生等温体积模量K _{T 0}  = 25.75（19）GPa，用于在非渗透性ME流体中进行压缩。由于Ne和He原子渗透到骨架的笼中，晶体结构显着硬化，导致K _{T 0}  = 42.5（1.2）GPa（Ne）和K _{T 0}  = 58（2）GPa（He）。如许多可比较的多孔结构所观察到的那样，在压力的影响下，拉曼光谱的演变和晶胞尺寸的变化都表明晶格变形，而没有导致完全的压力诱导的非晶化。在非穿透式ME中压缩，立方$Fd\overline{3}米$在1.7 GPa和2.2 GPa之间的压力范围内，以及在3.9 GPa和4.3 GPa之间的压力范围内，千叶石的骨架经历了第一个转变步骤。伴随的晶畴的形成不能可靠地确定扭曲的晶体结构。晶胞参数可能会建议压力> 1.7 GPa的单斜度度量和压力> 3.9 GPa的单斜度或四边形度量。然而，在一些样品中，甚至已经证明了不同程度的晶格畸变的晶体域的共存。