Binns Jack, He Yu, Donnelly Mary-Ellen, Peña-Alvarez Miriam, Wang Mengnan, Kim Duck Young, Gregoryanz Eugene, Dalladay-Simpson Philip, Howie Ross T
Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China.
Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China.
J Phys Chem Lett. 2020 May 7;11(9):3390-3395. doi: 10.1021/acs.jpclett.0c00688. Epub 2020 Apr 17.
When compressed in a matrix of solid hydrogen, many metals form compounds with increasingly high hydrogen contents. At high density, hydrogenic sublattices can emerge, which may act as low-dimensional analogues of atomic hydrogen. We show that at high pressures and temperatures, ruthenium forms polyhydride species that exhibit intriguing hydrogen substructures with counterintuitive electronic properties. RuH is synthesized from RuH in H at 50 GPa and at temperatures in excess of 1000 K, adopting a cubic structure with short H-H distances. When synthesis pressures are increased above 85 GPa, we observe RuH which crystallizes in a remarkable structure containing corner-sharing H octahedra. Calculations indicate this phase is semimetallic at 100 GPa.
当金属在固态氢基质中被压缩时，许多金属会形成氢含量越来越高的化合物。在高密度下，可能会出现氢化亚晶格，其可作为原子氢的低维类似物。我们表明，在高压和高温下，钌会形成多氢化物物种，这些物种呈现出具有反直觉电子性质的有趣氢子结构。RuH是在50 GPa和超过1000 K的温度下由H中的RuH合成的，采用具有短H-H距离的立方结构。当合成压力增加到85 GPa以上时，我们观察到RuH，它结晶成一种包含共角H八面体的显著结构。计算表明，该相在100 GPa时为半金属。
