| Autor: |
Elena Bykova, Egor Koemets, Carmen Sanchez-Valle, Valerio Cerantola, Ilya Kupenko, Stella Chariton, Leonid Dubrovinsky, Aleksandr I. Chumakov, Jeroen Jacobs, Maxim Bykov, Denis M. Vasiukov, Georgios Aprilis |
| Rok vydání: |
2021 |
| Předmět: |
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| Popis: |
The structure and properties of metal-hydrides at extreme conditions is key to the understanding of hydrogen-storage technologies, high-temperature superconductivity, and the dynamics of planetary cores. Here we investigate the phase relations and magnetic properties of iron hydrides, including two novel FeHx compounds, up to 63 GPa and 1800 K by Synchrotron Mössbauer Source spectroscopy and single-crystal X-ray diffraction. We observe the formation of a novel monoclinic iron hydride phase Fe2H∼3 at 63 GPa and 1000 K, which breaks down to a stoichiometric hexagonal closed packed FeH phase upon decompression below 52 GPa at 300 K. The long-range magnetic order in the two newly-synthetized phases persists to higher pressures compared to the well-known double hexagonal closed packed and face-centered cubic phases of FeH. The formation of magnetic Fe-H phases with high hydrogen concentration may influence the magnetic behavior of planetary metallic cores. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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