论文标题
C-S-H化合物的结构和组成可达143 GPA
Structure and composition of C-S-H compounds up to 143 GPa
论文作者
论文摘要
我们从氢气中的碳和硫的混合物中合成了两种C-S-H化合物，并在4 GPA的混合甲烷 - 氢液中合成了硫。 X射线同步加速器单晶衍射和拉曼光谱已分别应用于58和143 GPA。这两个样品均显示出类似的AL2CU型I4/MCM碱性对称性，而氢子系统则通过各种有序的分子和扩展的修饰以压力演变。甲烷轴承样品在激光加热至143 GPA时将对称性降低至正交性PNMA结构。结果表明，超导C-S-H化合物在结构上与常见的IM-3M H3S不同。
We synthesized two C-S-H compounds from a mixture of carbon and sulfur in hydrogen and from sulfur in mixed methane-hydrogen fluids at 4 GPa. X-ray synchrotron single-crystal diffraction and Raman spectroscopy have been applied to these samples up to 58 and 143 GPa, respectively. Both samples show a similar Al2Cu type I4/mcm basic symmetry, while the hydrogen subsystem evolves with pressure via variously ordered molecular and extended modifications. The methane bearing sample lowers symmetry to an orthorhombic Pnma structure after laser heating to 1400 K at 143 GPa. The results suggest that superconducting C-S-H compounds are structurally different from a common Im-3m H3S.
