Unusual volume reduction in CaLi2-xMgx by hydrogen uptake
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DOI[10.18957/rr.8.1.17]to the data of the same series
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- Material Type
- 記事
- Author/Editor
- Hyunjeong KimKouji SakakiKohta Asano
- Publication, Distribution, etc.
- Publication Date
- 2020-01-22
- Publication Date (W3CDTF)
- 2020-01-22
- Periodical title
- SPring-8/SACLA利用研究成果集
- No. or year of volume/issue
- 8(1)
- Volume
- 8(1)
- ISSN (Periodical Title)
- 2187-6886
- ISSN-L (Periodical Title)
- 2187-6886
- Text Language Code
- eng
- DOI
- 10.18957/rr.8.1.17
- Persistent ID (NDL)
- info:ndljp/pid/11670498
- Collection
- Collection (Materials For Handicapped People:1)
- Collection (particular)
- 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他
- Acquisition Basis
- オンライン資料収集制度
- Date Accepted (W3CDTF)
- 2021-05-13T20:29:08+09:00
- Date Captured (W3CDTF)
- 2020-03-25
- Format (IMT)
- application/pdf
- Access Restrictions
- 国立国会図書館内限定公開
- Service for the Digitized Contents Transmission Service
- 図書館・個人送信対象外
- Availability of remote photoduplication service
- 可
- Periodical Title (URI)
- Periodical Title (Persistent ID (NDL))
- info:ndljp/pid/11670493
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館デジタルコレクション
- Summary, etc.
- To understand the hydrogen storage properties of CaLi<sub>2-x</sub>Mg<sub>x</sub> having a C14 Laves phase structure, changes in its average and local structures by hydrogenation were investigated by using the Rietveld and the atomic pair distribution function analyses of X-ray diffraction data. We found that after hydrogen uptake at 283 K, Mg-containing samples exhibit a C14 phase with reduced volume. This C14 phase readily decomposes into CaH<sub>2</sub> at temperatures higher than 300 K. Our study suggests that hydrogen absorption in CaLi<sub>2-x</sub>Mg<sub>x</sub> at 283 K is multi-step reaction. Lithium that can easily diffuse through C14 crystals reacts with hydrogen forming a Li-rich hydride phase. On the other hand, slow diffusion of large Ca atoms and strong Mg-Mg and Mg-Ca interaction restrain the immediate formation of CaH<sub>2</sub>. As a result, there is a substantial time lag between the formation of a Li-rich hydride phase and the formation of CaH<sub>2</sub> at 283 K. This brings about a C14 phase with reduced volume where a large number of Li vacancies are present immediately after hydrogenation.
- DOI
- 10.18957/rr.8.1.17
- Access Restrictions
- インターネット公開
- Data Provider (Database)
- 科学技術振興機構 : J-STAGE
- Summary, etc.
- To understand the hydrogen storage properties of CaLi<sub>2-x</sub>Mg<sub>x</sub> having a C14 Laves phase structure, changes in its average and local structures by hydrogenation were investigated by using the Rietveld and the atomic pair distribution function analyses of X-ray diffraction data. We found that after hydrogen uptake at 283 K, Mg-containing samples exhibit a C14 phase with reduced volume. This C14 phase readily decomposes into CaH<sub>2</sub> at temperatures higher than 300 K. Our study suggests that hydrogen absorption in CaLi<sub>2-x</sub>Mg<sub>x</sub> at 283 K is multi-step reaction. Lithium that can easily diffuse through C14 crystals reacts with hydrogen forming a Li-rich hydride phase. On the other hand, slow diffusion of large Ca atoms and strong Mg-Mg and Mg-Ca interaction restrain the immediate formation of CaH<sub>2</sub>. As a result, there is a substantial time lag between the formation of a Li-rich hydride phase and the formation of CaH<sub>2</sub> at 283 K. This brings about a C14 phase with reduced volume where a large number of Li vacancies are present immediately after hydrogenation.
- DOI
- 10.18957/rr.8.1.17
- Related Material (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- Japan Link Center雑誌記事索引データベースCiNii Articles
- Bibliographic ID (NDL)
- 11670498
- NAID
- 130007969643