High-pressure synthesis and thermodynamic stability of 
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 up to 8 GPa

Geballe, Zachary M.; Somayazulu, Maddury; Armanet, Nicolas; Mishra, Ajay K.; Ahart, Muhtar; Hemley, Russell J.

doi:10.1103/physrevb.103.024515

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…High-pressure techniques are often needed to produce and sustain highly hydrided palladium. Recent studies have shown that, under sufficiently high pressures, the palladium matrix is capable of dissolving more hydrogen atoms, reaching a stoichiometry of PdH ∼1 at around 2 GPa and room temperature (Brownsberger et al, 2017;Guigue et al, 2020;Geballe et al, 2021). The formed PdH ∼1 was suggested to crystallize in the NaCl-typed structure, with hydrogen atoms filling the octahedral sites of the fcc Pd lattice.…”

Section: Interstitial Palladium Hydridesmentioning

confidence: 99%

Advances in highly hydrided palladium

Wang,

Zhang,

Guo

et al. 2024

Front. Mater.

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Palladium is a prototypical hydride-forming metal, which can accommodate a large volume of hydrogen through the formation of either interstitial or complex hydrides. Interstitial palladium hydrides, especially those with exceptionally high hydrogen loadings, have attracted considerable interest from the low-energy nuclear reaction (LENR) community, as they have been invoked to explain the anomalous nuclear effects related to the known but controversial Pons-Fleischmann experiment. Complex palladium hydrides also constitute a class of solid-state hydrides that present stoichiometric PdH2, PdH3, or PdH4 units within the crystal structure, but remain unexplored as far as the unusual H/Pd ratio is concerned. This minireview gives a brief introduction to these two types of solid-state palladium hydrides, with the hope of providing some information for materials development relevant to LENR research.

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Section: Interstitial Palladium Hydridesmentioning

confidence: 99%

Advances in highly hydrided palladium

Wang,

Zhang,

Guo

et al. 2024

Front. Mater.

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Prediction of ambient-pressure superconductivity in ternary hydride PdCuHx

Vocaturo

Tresca

Ghiringhelli

et al. 2022

Journal of Applied Physics

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Combining pressure and electrochemistry to synthesize superhydrides

Guan

Hemley

Viswanathan

2021

Proc. Natl. Acad. Sci. U.S.A.

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Recently, superhydrides have been computationally identified and subsequently synthesized with a variety of metals at very high pressures. In this work, we evaluate the possibility of synthesizing superhydrides by uniquely combining electrochemistry and applied pressure. We perform computational searches using density functional theory and particle swarm optimization calculations over a broad range of pressures and electrode potentials. Using a thermodynamic analysis, we construct pressure–potential phase diagrams and provide an alternate synthesis concept, pressure–potential (P2), to access phases having high hydrogen content. Palladium–hydrogen is a widely studied material system with the highest hydride phase being Pd3H4. Most strikingly for this system, at potentials above hydrogen evolution and ∼ 300 MPa pressure, we find the possibility to make palladium superhydrides (e.g., PdH10). We predict the generalizability of this approach for La-H, Y-H, and Mg-H with 10- to 100-fold reduction in required pressure for stabilizing phases. In addition, the P2 strategy allows stabilizing additional phases that cannot be done purely by either pressure or potential and is a general approach that is likely to work for synthesizing other hydrides at modest pressures.

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High-pressure synthesis and thermodynamic stability of PdH1±ε up to 8 GPa

Cited by 3 publications

References 47 publications

Advances in highly hydrided palladium

Advances in highly hydrided palladium

Prediction of ambient-pressure superconductivity in ternary hydride PdCuHx

Combining pressure and electrochemistry to synthesize superhydrides

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