2019年 第5卷 第3期
《工程（英文）》 >> 2019年 第5卷 第3期 doi: 10.1016/j.eng.2019.03.001
高压下铜-氢化合物体系的结构研究
a Center for High Pressure Science & Technology Advanced Research, Shanghai 201203, China
b Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK
c Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
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摘要
理论和实验研究都表明，极端高压条件下氢气和众多金属或非金属所构成的二元体系化合物的物理性质显著增强，这使得含氢二元体系成为高压科学领域的重要研究对象。尽管氢气的化学性质活泼，但一些贵金属（如铜、银、金）依旧很难在常温常压下与氢气反应生成相应的金属氢化物，截至目前，没有任何贵金属与氢的摩尔比大于1的稳定化合物被报道。在本研究中，我们通过结合原位激光加热，在金刚石对顶砧压腔中通过氢气和金属铜单质反应成功合成了铜-氢二元化合物。通过对X射线衍射数据进行分析，我们探究了从常压到最高50 GPa压力范围内铜-氢体系的相行为和稳定性。该实验证实了前期理论预测的三个铜-氢化合物相：γ0-CuH0.15、γ1-CuH0.5和ε-Cu2H。更值得一提的是，该研究还通过对金刚石对顶砧腔体内部样品进行激光加热，合成了目前已知的室温下最高氢含量和稳定性的贵金属氢化物γ2-CuH0.65。该项研究加深了人们对于过渡金属-氢化合物体系的认知，同时，通过该实验合成的氢化物由于具有很高的含氢量，有望被设计成理想的储氢材料。
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