通过氢和硫的化学反应确定的H-S系统中的稳定高压相
Stable high-pressure phases in the H-S system determined by chemically reacting hydrogen and sulfur
摘要：
同步辐射X射线衍射和拉曼光谱已被用于研究分子氢（H2）与硫（S）在高压下的化学反应。我们发现理论预测的Cccm和Im-3 m H3 S的反应产物在50和140 GPa，分别。Im-3 mH 3S在140 GPa以上是稳定的晶相，并且在低于140 GPa的压力释放时转变为R3 mH 3S。后一相在低至至少70 GPa时是（Meta）稳定的，其中其在退火（T<1300 K）时转化为Cccm H3 S以克服动力学阻碍。Cccm H3 S在50 GPa下具有具有对称氢键的扩展结构，并且在减压时，它经历了在低于40 GPa下的分子混合H2S-H2结构的转变，而晶体对称性没有任何明显的变化。
英文摘要：
Synchrotron X-ray diffraction and Raman spectroscopy have been used to study chemical reactions of molecular hydrogen (H2) with sulfur (S) at high pressures. We find theoretically predicted Cccm and Im-3m H3S to be the reaction products at 50 and 140 GPa, respectively. Im-3m H3S is a stable crystalline phase above 140 GPa and it transforms to R3m H3S on pressure release below 140 GPa. The latter phase is (meta)stable down to at least 70 GPa where it transforms to Cccm H3S upon annealing (T<1300 K) to overcome the kinetic hindrance. Cccm H3S has an extended structure with symmetric hydrogen bonds at 50 GPa and upon decompression it experiences a transformation to a molecular mixed H2S-H2 structure below 40 GPa without any apparent change in the crystal symmetry.
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