Combining pressure and electrochemistry to synthesize superhydrides

experimental metallization limit moving step by step from 150 [4] to 430-500 GPa. [1,5] A consistent increase in pressure leads to a series of phase transitions in solid hydrogen (phases Ι-V [1,5] ), gradual quenching of the Raman signals, and darkening of the sample down to a complete loss of transparency. Despite a significant progress in achieving ultrahigh pressures in the last five years, detecting superconductivity of metallic hydrogen remains an unsolved problem. Studies of the electrical conductivity at pressures above 400 GPa remain very challenging.In 2004, N. Ashcroft suggested that the precompression effects caused by chemical bonding to other atoms may help to convert hydrogen to a metallic state. Fifteen years later, this idea was confirmed in the synthesis of many metallic and superconducting hydrides such as H 3 S, [6,7] LaH 10 , [8,9] YH 6 , [10,11] YH 9 , [11,12] ThH 10 , [13] CeH 9 , [14] PrH 9 , [15] NdH 9 , [16] and so forth. It is believed now that the superconducting properties of these compounds are due to the presence of a sublattice of metallic hydrogen, which is formed in pure hydrogen only at pressures of 500-700 GPa.There must be an intermediate link between these two forms of hydrogen, metallic and superconducting, and a molecular Recently, several research groups announced reaching the point of metallization of hydrogen above 400 GPa. Despite notable progress, detecting superconductivity in compressed hydrogen remains an unsolved problem. Following the mainstream of extensive investigations of compressed metal polyhydrides, here small doping of molecular hydrogen by strontium is demonstrated to lead to a dramatic reduction in the metallization pressure to ≈200 GPa. Studying the high-pressure chemistry of the Sr-H system, the formation of several new phases is observed: C2/m-Sr 3 H 13 , pseudocubic SrH 6 , SrH 9 with cubic F m 43 -Sr sublattice, and pseudo tetragonal superionic P1-SrH 22 , the metal hydride with the highest hydrogen content (96 at%) discovered so far. High diffusion coefficients of hydrogen in the latter phase D H = 0.2-2.1 × 10 −9 m 2 s −1 indicate an amorphous state of the H-sublattice, whereas the strontium sublattice remains solid. Unlike Ca and Y, strontium forms molecular semiconducting polyhydrides, whereas calcium and yttrium polyhydrides are high-T C superconductors with an atomic H sublattice. The discovered SrH 22 , a kind of hydrogen sponge, opens a new class of materials with ultrahigh content of hydrogen.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202200924.

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“…These properties make it possible to use strontium polyhydrides as a solid electrolyte for high‐pressure electrochemical reactions. [ 37 ]…”

Section: Resultsmentioning

confidence: 99%

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

et al. 2022

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“…Note: While in preparation, we have become aware of four publications that attempt to explain our finding (Ge et al, 2021;Guan et al, 2021;Liang et al, 2021;Di Cataldo et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Hot Hydride Superconductivity Above 550 K

Grockowiak

Ahart

Helm

et al. 2022

Front. Electron. Mater

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The search for room temperature superconductivity has accelerated in the last few years driven by experimentally accessible theoretical predictions that indicated alloying dense hydrogen with other elements could produce conventional superconductivity at high temperatures and pressures. These predictions helped inform the synthesis of simple binary hydrides that culminated in the discovery of the superhydride LaH10 with a superconducting transition temperature Tc of 260 K at 180 GPa. We have now successfully synthesized a metallic La-based superhydride with an initial Tc of 294 K. When subjected to subsequent thermal excursions that promoted a chemical reaction to a higher order system, the Tc onset was driven irreversibly to 556 K. X-ray characterization confirmed the formation of a distorted LaH10 based backbone that suggests the formation of ternary or quaternary compounds with substitution at the La and/or H sites. The results provide evidence for hot superconductivity, aligning with recent predictions for higher order hydrides under pressure.

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“…While applying string theory to topology can be indiscreet, the series of experiments suggest an informatics approach to electrolytes from primary cosmic sources is possible with unperturbed Hamiltonian H 0 |ψ i ⟩ = E i |ψ⟩, solving the equation I put forth [43,44]. With the of quantum computing for future detection, further amplifications on the user end-device and user-end devices for hydro-sample proton decay are possible [45]. With discrete approach in proton decay without theoretical input of dark energy, the work of Srinivas et al illustrated mass gain empirically from actinic radiation, where the electrodes can enhance further detection [46].…”

Section: High-frequency Doppler-shift With Informatics Electrolytementioning

confidence: 99%

Data-Driven Insights to Cosmology in the Dark Universe

2022

JPCPPR

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The research provides a qualitative analysis with data-driven evidence on the dark energy and dark universe in cosmology and large-scale structure. It provides a descriptive account of the causal significance of black hole and white hole thermonuclear binding to instrumental observational schemes. The article adopted a postpositive paradigm in reorganizing from the previous experimental procedures and finer details not previously covered. The qualitative research into the dark universe has not yet reached a quantifiable stage but may contribute to the data-driven and informatics approaches to the supplement of the simulation methods that underly the services for observation coordination. The research proposes that the change in Shannon Entropy with regard to fundamental asymmetry and CP violation may contribute to data-driven insights into the cosmological large-scale structure, with an electrolyte and hydrolysis approach to quantum superconductive information.

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Combining pressure and electrochemistry to synthesize superhydrides

Cited by 13 publications

References 70 publications

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

Hot Hydride Superconductivity Above 550 K

Data-Driven Insights to Cosmology in the Dark Universe

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Combining pressure and electrochemistry to synthesize superhydrides

Cited by 13 publications

References 70 publications

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH22

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH22

Hot Hydride Superconductivity Above 550 K

Data-Driven Insights to Cosmology in the Dark Universe

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Product

Resources

About

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂