Knowledge Management System of Hefei Institute of Physical Science，CAS
| Synthesis and structure of carbon-doped H3S compounds at high pressure | |
Goncharov, Alexander F.1; Bykova, Elena1; Bykov, Maxim1,2; Zhang, Xiao3; Wang, Yu3 ; Chariton, Stella4; Prakapenka, Vitali B.4; Smith, Jesse S.5
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| 2022-01-14 | |
| 发表期刊 | JOURNAL OF APPLIED PHYSICS
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| ISSN | 0021-8979 |
| 通讯作者 | Goncharov, Alexander F.(agoncharov@carnegiescience.edu) |
| 摘要 | Understanding of recently reported putative close-to-room-temperature superconductivity in C-S-H compounds at 267 GPa demands a reproducible synthesis protocol as well as knowledge of the compounds' structure and composition. We synthesized C-S-H compounds with various carbon compositions at high pressures from elemental carbon C and methane CH4, sulfur S, and molecular hydrogen H-2. Here, we focus on compounds synthesized using methane as these allow a straightforward determination of their structure and composition by combining single-crystal x-ray diffraction and Raman spectroscopy. We applied a two-stage synthesis of [(CH4)(x)(H2S)((1-x))](2)H-2 compounds with various compositions by first reacting sulfur and mixed methane-hydrogen fluids and forming CH4-doped H2S crystals at 0.5-3 GPa and then by growing single crystals of the desired hydrogen-rich compound. Raman spectroscopy applied to this material shows the presence of CH4 molecules incorporated into the lattice and allows the determination of the CH4 content, while single-crystal x-ray diffraction results suggest that the methane molecules substitute H2S molecules. The structural behavior of these compounds is very similar to the previously investigated methane-free crystals demonstrating a transition from Al2Cu type I4/mcm molecular crystal to a modulated molecular structure at 20-30 GPa and back to the same basic I4/mcm structure in an extended modification with greatly modified Raman spectra. This latter phase demonstrates a distortion into a Pnma structure at 132-159 GPa and then transforms into a common I m 3 over bar m H3S phase at higher pressures; however, no structural anomaly is detected near 220 GPa, where a sharp upturn in T-c has been reported. |
| DOI | 10.1063/5.0073499 |
| 关键词[WOS] | ROOM-TEMPERATURE SUPERCONDUCTIVITY ; CRYSTAL-STRUCTURE ; SPECTROSCOPY ; HYDRIDE ; SYSTEM |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Science Foundation-Earth Sciences[EAR-1634415] ; NSF MRI Proposal[EAR-1531583] ; DOE-NNSA's Office of Experimental Sciences ; DOE Office of Science[DE-AC02-06CH11357] ; Army Research Office[W911NF-19-2-0172] ; Carnegie Institution of Washington ; National Natural Science Foundation of China (NNSFC)[51672279] ; National Natural Science Foundation of China (NNSFC)[51727806] ; National Natural Science Foundation of China (NNSFC)[11874361] ; National Natural Science Foundation of China (NNSFC)[11774354] ; CASHIPS Director's Fund[YZJJ2020QN22] ; Science Challenge Projects[TZ2016001] |
| 项目资助者 | National Science Foundation-Earth Sciences ; NSF MRI Proposal ; DOE-NNSA's Office of Experimental Sciences ; DOE Office of Science ; Army Research Office ; Carnegie Institution of Washington ; National Natural Science Foundation of China (NNSFC) ; CASHIPS Director's Fund ; Science Challenge Projects |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Applied |
| WOS记录号 | WOS:000741100900006 |
| 出版者 | AIP Publishing |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/127112 |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Goncharov, Alexander F. |
| 作者单位 | 1.Carnegie Inst Sci, Earth & Planets Lab, 5251 Broad Branch Rd NW, Washington, DC 20015 USA 2.Howard Univ, Dept Math, Washington, DC 20059 USA 3.Chinese Acad Sci, HFIPS, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China 4.Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA 5.Argonne Natl Lab, HPCAT, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA |
| 推荐引用方式 GB/T 7714 | Goncharov, Alexander F.,Bykova, Elena,Bykov, Maxim,et al. Synthesis and structure of carbon-doped H3S compounds at high pressure[J]. JOURNAL OF APPLIED PHYSICS,2022,131. |
| APA | Goncharov, Alexander F..,Bykova, Elena.,Bykov, Maxim.,Zhang, Xiao.,Wang, Yu.,...&Smith, Jesse S..(2022).Synthesis and structure of carbon-doped H3S compounds at high pressure.JOURNAL OF APPLIED PHYSICS,131. |
| MLA | Goncharov, Alexander F.,et al."Synthesis and structure of carbon-doped H3S compounds at high pressure".JOURNAL OF APPLIED PHYSICS 131(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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