Impact of nano-scale cavities on hydrogen storage and retention in yttrium hydride

Nedim Cinbiz, M.; Lach, Timothy; Topsakal, Mehmet; Le Coq, Annabelle; Linton, Kory

doi:10.1016/j.mtla.2023.101933

Title: Impact of nano-scale cavities on hydrogen storage and retention in yttrium hydride

Journal Article · 26 October 2023 · Materialia

DOI: https://doi.org/10.1016/j.mtla.2023.101933 · OSTI ID:2216997

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Idaho National Laboratory (INL), Idaho Falls, ID (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

Here, in situ synchrotron high-energy x-ray diffraction experiments and detailed transmission electron microscopy (TEM) characterization were conducted on as-fabricated and neutron-irradiated yttrium hydrides. The high-resolution synchrotron x-ray diffraction revealed minor α yttrium and major δ yttrium hydride phases in all specimens. Specimens were subject to heat treatments (heating-cooling cycles), and the intensity of α yttrium partially and completely disappeared in as-fabricated and neutron-irradiated specimens, respectively. The disappearance of α yttrium was unforeseen because hydrogen was expected to leave δ phase, causing an increase in α yttrium diffraction peak intensity. This observation indicated a surplus of hydrogen in the specimens where it was odd for hydride-forming early transition metal elements. The subsequent through-focus TEM characterization discovered nanometric cavities in both as-fabricated and neutron-irradiated yttrium hydride specimens for the first time. Two types of cavities were identified as fabrication-caused and irradiation-induced. The fabrication-caused cavities were associated with regions having linear deformation features, interfaces, and inclusions. The irradiation-induced cavities were observed as being formed isolated in the yttrium hydride phase. The presence of such nanometric cavities was considered as potential hydrogen storage pockets where the overall hydrogen storing capacity of yttrium hydride would be enhanced.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; AC07-05ID14517; SC0012704

OSTI ID:: 2216997

Alternate ID(s):: OSTI ID: 2319181

Journal Information:: Materialia, Journal Name: Materialia Journal Issue: 1 Vol. 32; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36
73
metal hydrides
yttrium hydride
hydrogen
synchrotron diffraction
transmission electron microscopy
nanometric cavities
irradiation-induced defects
radiation-damage
neutron irradiation

Title: Impact of nano-scale cavities on hydrogen storage and retention in yttrium hydride

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