2024-03-29T07:13:00Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00023049
2023-01-16T04:29:10Z
1939:1940:1941
Multiple phase separation of super-abundant-vacancies in Pd hydrides by all solid-state electrolysis in moderate temperatures around 300 °C
Fukada, Yoshiki
68182
Hioki, Tatsumi
68183
Motohiro, Tomoyoshi
68184
The dynamics of hydrogen-induced vacancies are the key for understanding various phenomena in metal–hydrogen systems under a high hydrogen chemical potential. In this study, a novel dry-electrolysis experiment was performed in which a hydrogen isotope was injected into a Pd cathode and time-resolved in situ monochromatic X-ray diffraction measurement was carried out at the Pd cathode. It was found that palladium-hydride containing vacancies forms multiple phases depending on the hydrogen chemical potential. Phase separation into vacancy-rich, vacancy-poor, and moderate-vacancy-concentration phases was observed when the input voltage was relatively low, i.e., ∼0.5 V. The moderate-vacancy-concentration phase may be attributed to Ca7Ge or another type of super-lattice Pd7VacH(D)8. Transition from the vacancy-rich to the moderate-vacancy-concentration phase explains the sub-micron void formations without high temperature treatment that were observed at the Pd cathode but have never been reported in previous anvil experiments.
journal article
Elsevier
2016-12
application/pdf
Journal of Alloys and Compounds
688B
404
412
http://dx.doi.org/10.1016/j.jallcom.2016.07.176
http://hdl.handle.net/2237/25240
0925-8388
https://nagoya.repo.nii.ac.jp/record/23049/files/sav2_paper_riv_submit.pdf
eng
https://doi.org/10.1016/j.jallcom.2016.07.176
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/