Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions
Abstract In recent years, metal hydride research has become one of the driving forces of the high-pressure community, as it is believed to hold the key to superconductivity close to ambient temperature. While numerous novel metal hydride compounds have been reported and extensively investigated for...
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Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-56033-3 |
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| author | Yishan Zhou Yunhua Fu Meng Yang Israel Osmond Rajesh Jana Takeshi Nakagawa Owen Moulding Jonathan Buhot Sven Friedemann Dominique Laniel Thomas Meier |
| author_facet | Yishan Zhou Yunhua Fu Meng Yang Israel Osmond Rajesh Jana Takeshi Nakagawa Owen Moulding Jonathan Buhot Sven Friedemann Dominique Laniel Thomas Meier |
| author_sort | Yishan Zhou |
| collection | DOAJ |
| description | Abstract In recent years, metal hydride research has become one of the driving forces of the high-pressure community, as it is believed to hold the key to superconductivity close to ambient temperature. While numerous novel metal hydride compounds have been reported and extensively investigated for their superconducting properties, little attention has been focused on the atomic and electronic states of hydrogen, the main ingredient in these novel compounds. Here, we present combined 1 H- and 139 L a-NMR data on lanthanum superhydrides, L a H x , (x = 10.2 − 11.1), synthesized after laser heating at pressures above 160 GPa. Strikingly, we found hydrogen to be in a highly diffusive state at room temperature, with diffusion coefficients in the order of 10−6 c m 2 s −1. We found that this diffusive state of hydrogen results in a dynamic de-hydrogenation of the sample over the course of several weeks, approaching a composition similar to its precursor materials. Quantitative measurements demonstrate that the synthesized superhydrides continuously decompose over time. Transport measurements underline this conclusion as superconducting critical temperatures were found to decrease significantly over time as well. This observation sheds new light on formerly unanswered questions on the long-term stability of metal superhydrides. |
| format | Article |
| id | doaj-art-1f834c8b52d0466093bcf7175fd32239 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-1f834c8b52d0466093bcf7175fd322392025-02-02T12:31:19ZengNature PortfolioNature Communications2041-17232025-01-011611810.1038/s41467-025-56033-3Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditionsYishan Zhou0Yunhua Fu1Meng Yang2Israel Osmond3Rajesh Jana4Takeshi Nakagawa5Owen Moulding6Jonathan Buhot7Sven Friedemann8Dominique Laniel9Thomas Meier10Center for High-Pressure Science and Technology Advance ResearchCenter for High-Pressure Science and Technology Advance ResearchCenter for High-Pressure Science and Technology Advance ResearchCenter for Science at Extreme ConditionsCenter for High-Pressure Science and Technology Advance ResearchCenter for High-Pressure Science and Technology Advance ResearchInstitut Néel CNRS/UGA UPR2940H.H. Wills Physics Laboratory, University of BristolH.H. Wills Physics Laboratory, University of BristolCenter for Science at Extreme ConditionsShanghai Key Laboratory MFree, Institute for Shanghai Advanced Research in Physical SciencesAbstract In recent years, metal hydride research has become one of the driving forces of the high-pressure community, as it is believed to hold the key to superconductivity close to ambient temperature. While numerous novel metal hydride compounds have been reported and extensively investigated for their superconducting properties, little attention has been focused on the atomic and electronic states of hydrogen, the main ingredient in these novel compounds. Here, we present combined 1 H- and 139 L a-NMR data on lanthanum superhydrides, L a H x , (x = 10.2 − 11.1), synthesized after laser heating at pressures above 160 GPa. Strikingly, we found hydrogen to be in a highly diffusive state at room temperature, with diffusion coefficients in the order of 10−6 c m 2 s −1. We found that this diffusive state of hydrogen results in a dynamic de-hydrogenation of the sample over the course of several weeks, approaching a composition similar to its precursor materials. Quantitative measurements demonstrate that the synthesized superhydrides continuously decompose over time. Transport measurements underline this conclusion as superconducting critical temperatures were found to decrease significantly over time as well. This observation sheds new light on formerly unanswered questions on the long-term stability of metal superhydrides.https://doi.org/10.1038/s41467-025-56033-3 |
| spellingShingle | Yishan Zhou Yunhua Fu Meng Yang Israel Osmond Rajesh Jana Takeshi Nakagawa Owen Moulding Jonathan Buhot Sven Friedemann Dominique Laniel Thomas Meier Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions Nature Communications |
| title | Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions |
| title_full | Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions |
| title_fullStr | Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions |
| title_full_unstemmed | Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions |
| title_short | Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions |
| title_sort | diffusion driven transient hydrogenation in metal superhydrides at extreme conditions |
| url | https://doi.org/10.1038/s41467-025-56033-3 |
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