The Ce-H (Cerium-Hydrogen) system

Manchester, F. D.; Pitre, J. M.

doi:10.1007/bf02646759

Cited by 18 publications

(13 citation statements)

References 49 publications

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“…This is consistent with the experimental observation. 12 Similar to the monohydride of La,Y, and Sc being stable at high pressures, 4 CeH is stable but in a very narrow pressure range near 6 GPa.…”

Section: Resultsmentioning

confidence: 96%

“…The calculated Ce-H separations of 2.35 Å match the experimental crystallographic values at P = 1 atm. 12 CeH 2.5 adopts the tetragonal I 4 1 / amd structure ( Z = 8, Figure 3 b). This structure is similar to an alternative combination of fcc CeH 2 and fcc CeH 3 .…”

Section: Resultsmentioning

confidence: 99%

“…This is in accordance with the trend that extra H atoms enter into the octahedral interstices during the formation of continuous solid solution CeH x (2.0 < x < 3.0). 12 …”

Section: Resultsmentioning

confidence: 99%

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New Insights into Phase Separation of Cerium Hydrides under Pressure

2022

ACS Omega

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We report theoretical calculations of the static ground-state structures and pressure-induced phase transformations of four cerium hydrides: CeH, CeH 2 , CeH 2.5 , and CeH 3 . Under pressure, the experimental CaF 2 -type structure of CeH 2 is likely to disproportionate to face-centered cubic (fcc) Ce and a cubic Pm 3̅ n (β-UH 3 type) structure of CeH 3 above 6 GPa. At further increasing pressures, fcc Ce will transform to a tetragonal I 4/ mmm structure above 12 GPa, while CeH 3 moves through the following sequence of phases: Pm 3 ®n (β-UH 3 type) → Pm 3̅ n (A15 type) → R 3 ®m ; the corresponding transition pressures are calculated to be 10 and 70 GPa, respectively. The tetragonal I 4 1 / amd structure of CeH 2.5 has the similar decomposition as that of CeH 2 . Finding this previously unreported pressure-induced decomposition of CeH 2 will pave the way for investigations on the nature of hydrogen–metal interactions.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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New Insights into Phase Separation of Cerium Hydrides under Pressure

2022

ACS Omega

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“…In some cases there are significant deviations from the van't Hoff straight lines at temperatures below about 600 • C. We attribute this deviations to slow kinetics of hydrogen absorption, and they are not included in the derivations of H f and S f . Our results for Ce dihydride, [8,9]. We obtain H f = (−98.2 ± 3) kJ/(mole H) and S f = (−65.1 ± 3.1) J/(K × mole H) for GdH 2 , if 600 • C data points are included in our analysis.…”

Section: Hydride Formationmentioning

confidence: 85%

Hydrogen absorption in CexGd1−x alloys

Bereznitsky¹,

Bloch²,

Yonovich³

et al. 2012

Journal of Alloys and Compounds

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“…The low equilibrium pressure between a solid-solution of Ce H and the hydride CeH 2 (<10 −2 Torr at 773 K) [1] suggests that Ce could be used to getter H isotopes from the molten liquids used to cool nuclear reactors and also for the removal of tritium from gaseous streams [2,3]. However, like the other elements in the lanthanide series, Ce reacts readily with O to form a passive surface layer [4].…”

Section: Introductionmentioning

confidence: 98%