Journal of Applied Physics, volume 131, issue 2, pages 25902
Synthesis and structure of carbon-doped H3S compounds at high pressure
1
Earth and Planets Laboratory, Carnegie Institution of Washington 1 , 5251 Broad Branch Road NW, Washington, DC 20015, USA
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2
Department of Mathematics, Howard University 2 , Washington, DC 20059, USA
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3
Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences 3 , Hefei 230031, Anhui, People's Republic of China
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4
Center for Advanced Radiation Sources, University of Chicago 4 , Chicago, Illinois 60637, USA
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Publication type: Journal Article
Publication date: 2022-01-10
Journal:
Journal of Applied Physics
Quartile SCImago
Q2
Quartile WOS
Q2
Impact factor: 3.2
ISSN: 00218979, 10897550
General Physics and Astronomy
Abstract
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 H2. 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)]2H2 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 Im3¯m H3S phase at higher pressures; however, no structural anomaly is detected near 220 GPa, where a sharp upturn in Tc has been reported.
Citations by journals
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Advanced Materials
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1 publication, 12.5%
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Citations by publishers
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American Physical Society (APS)
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American Physical Society (APS)
2 publications, 25%
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Wiley
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1 publication, 12.5%
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1 publication, 12.5%
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Springer Nature
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Springer Nature
1 publication, 12.5%
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Royal Society of Chemistry (RSC)
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1 publication, 12.5%
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American Chemical Society (ACS)
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American Chemical Society (ACS)
1 publication, 12.5%
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Goncharov A. et al. Synthesis and structure of carbon-doped H3S compounds at high pressure // Journal of Applied Physics. 2022. Vol. 131. No. 2. p. 25902.
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Goncharov A., Bykova E., Bykov M., Zhang X., Wang Yu., Chariton S., Prakapenka V., Smith J. J. Synthesis and structure of carbon-doped H3S compounds at high pressure // Journal of Applied Physics. 2022. Vol. 131. No. 2. p. 25902.
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TY - JOUR
DO - 10.1063/5.0073499
UR - https://doi.org/10.1063%2F5.0073499
TI - Synthesis and structure of carbon-doped H3S compounds at high pressure
T2 - Journal of Applied Physics
AU - Goncharov, Alexander
AU - Bykova, E.
AU - Bykov, Maxim
AU - Zhang, Xiao
AU - Wang, Yu
AU - Chariton, Stella
AU - Prakapenka, V.
AU - Smith, Jesse J.
PY - 2022
DA - 2022/01/10 00:00:00
PB - American Institute of Physics (AIP)
SP - 25902
IS - 2
VL - 131
SN - 0021-8979
SN - 1089-7550
ER -
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@article{2022_Goncharov,
author = {Alexander Goncharov and E. Bykova and Maxim Bykov and Xiao Zhang and Yu Wang and Stella Chariton and V. Prakapenka and Jesse J. Smith},
title = {Synthesis and structure of carbon-doped H3S compounds at high pressure},
journal = {Journal of Applied Physics},
year = {2022},
volume = {131},
publisher = {American Institute of Physics (AIP)},
month = {jan},
url = {https://doi.org/10.1063%2F5.0073499},
number = {2},
pages = {25902},
doi = {10.1063/5.0073499}
}
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MLA
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Goncharov, Alexander, et al. “Synthesis and structure of carbon-doped H3S compounds at high pressure.” Journal of Applied Physics, vol. 131, no. 2, Jan. 2022, p. 25902. https://doi.org/10.1063%2F5.0073499.