@article{oai:repo.qst.go.jp:00081791,
 author = {Kuno, Keiji and Matsuoka, Takahiro and Masuda, Ryo and Mitsui, Takaya and Seto, Makoto and Machida, Akihiko and Fujihisa, Hiroshi and Hirao, Naohisa and Ohishi, Yasuo and Shimizu, Katsuya and Sasaki, Shigeo and Takaya, Mitsui and Akihiko, Machida},
 journal = {Journal of Alloys and Compounds},
 month = {Feb},
 note = {Raman scattering, Mossbauer spectroscopy, and X-ray diffraction measurements have revealed that EuHx compressed in high-pressure hydrogen exhibits the crystal structure changes and the divalent (Eu2+) to trivalent (Eu3+) changes via two Eu2+/Eu3+ mixed-valence phases: EuHx-I (Pnma, x=2, Eu2+) to  EuHx-II (P63/mmc, x=2, 7.0 GPa, Eu2+) to EuHx-III (I4/m, x~2.2, 7.0−9.0 GPa, Eu2+/Eu3+) to  EuHx-V (x~2.8, 9.0−12.4 GPa, Eu2+/Eu3+) to EuHx-VI (x~3, 12.4−14.4 GPa, Eu3+) to EuHx-VII (x~3, 14.4−16 GPa, Eu3+) to EuHx-IV (I4/mmm, x~3, 16 GPa−, Eu3+). The EuHx-II transforms to EuHx-III at a constant pressure near 7.0 GPa due to the reaction with hydrogen. Our results also demonstrate that Mossbauer spectroscopy can be a useful marker to detect the hydrogen storing in metal hydrides.},
 title = {Mixed-valence state and structure changes of EuHx (x = 2 and 2 < x ≤ 3) under high-pressure H2 atmosphere},
 volume = {865},
 year = {2021}
}