In situ X‐Ray Diffraction Analysis of the Pd—H System at High Pressure

Azambuja, Viviane M.; Miraglia, S.; Fruchart, D.; Tavares, Sérgio Souto Maior; Santos, Diógenesdos Dos; Mézouar, M.

doi:10.1002/chin.200609020

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“…3,4 Work on substoichometric PdH x , and PdD x (x ≤ 1) has been carried out in the search for still higher T c . 5,6 For these compositions, PdH x and PdD x exhibit an inverse isotope effect, in which, contrary to the established formalism for Bardeen-Cooper-Schrieffer (BCS)-type superconductivity, PdD x has a higher superconducting transition temperature than PdH x . 7 The inverse isotope effect has been attributed to anharmonicity in the lattice vibrations as supported by measured Debye−Waller factors and theoretical calculations.…”

Section: Introductionmentioning

confidence: 86%

X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures

et al. 2017

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High-pressure X-ray diffraction of PdH x and PdD x demonstrates that these materials remain in a face-centered cubic (fcc, Fm3̅m) structure to megabar pressures at room temperature. The volumes indicate stoichiometric compositions under pressure with x = 1 for both materials. No indication of any phase transition was observed up to the highest pressures reached in the experiments. A third-order Birch–Murnaghan equation of state used to fit the pressure–volume data gives V 0 = 10.73 (±0.03) cm3/mol, K 0 = 147 (±11) GPa, and K 0′ = 4.7 (±0.5), whereas a Vinet fit gives V 0 = 10.74 (±0.03) cm3/mol, K 0 = 143 (±11) GPa, and K 0′ = 5.1 (±0.5), for the combined data for both PdH x and PdD x . The results are used to obtain the pressure dependence of the effective volume of H and D atoms in PdH x and PdD x to megabar pressures for comparison with other simple hydrides with implications for superconductivity in this class of materials.

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Section: Introductionmentioning

confidence: 86%

X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures

et al. 2017

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In situ X‐Ray Diffraction Analysis of the Pd—H System at High Pressure

Cited by 1 publication

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X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures

X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures

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In situ X‐Ray Diffraction Analysis of the Pd—H System at High Pressure

Cited by 1 publication

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X-ray Diffraction, Lattice Structure, and Equation of State of PdHxand PdDxto Megabar Pressures

X-ray Diffraction, Lattice Structure, and Equation of State of PdHxand PdDxto Megabar Pressures

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X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures

X-ray Diffraction, Lattice Structure, and Equation of State of PdH_xand PdD_xto Megabar Pressures