Formation process of perovskite-type hydride LiNiH3: <i>In situ</i> synchrotron radiation X-ray diffraction study
Ryutaro SatoInstitute for Materials Research, Tohoku University 1 , Sendai 980-8577, JapanHiroyuki SaitohQuantum Beam Science Directorate, Japan Atomic Energy Agency 2 , Hyogo 679-5148, JapanNaruki EndoQuantum Beam Science Directorate, Japan Atomic Energy Agency 2 , Hyogo 679-5148, JapanShigeyuki TakagiInstitute for Materials Research, Tohoku University 1 , Sendai 980-8577, JapanMotoaki MatsuoInstitute for Materials Research, Tohoku University 1 , Sendai 980-8577, JapanKatsutoshi AokiInstitute for Materials Research, Tohoku University 1 , Sendai 980-8577, JapanShin‐ichi OrimoInstitute for Materials Research, Tohoku University 1 , Sendai 980-8577, Japan
2013en
ABI
Аннотация
The formation process of perovskite-type hydride LiNiH3 was investigated using in situ synchrotron X-ray diffraction measurements. A mixture of LiH and Ni was hydrogenated at 873 K and 3 GPa, and the structural changes associated with hydrogenation were observed. Time-resolved diffraction profiles showed a three-step reaction: hydrogenation of Ni to NiHx, formation of LiyNi1–yH solid solution, and conversion to perovskite-type hydride LiNiH3. The solid solution, which has never been reported, plays the role of the precursor in the perovskite formation and its presence is apparently critical for synthesizing perovskite-type hydrides.
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