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Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe13 (M = La, Sm, and U)
| Title: | Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe13 (M = La, Sm, and U) |
| Authors: | Hidaka, Hiroyuki Browse this author →KAKEN DB | | Nagata, Ryoma Browse this author | | Tabata, Chihiro Browse this author | | Shimizu, Yusei Browse this author | | Miura, Naoyuki Browse this author | | Yanagisawa, Tatsuya Browse this author →KAKEN DB | | Amitsuka, Hiroshi Browse this author →KAKEN DB |
| Keywords: | Acoustic phonons | | Crystal structure | | Metals | | Optical phonons | | X-Ray powder diffraction | | Condensed Matter & Materials Physics |
| Issue Date: | 9-May-2018 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review Materials |
| Volume: | 2 |
| Issue: | 5 |
| Start Page: | 053603 |
| Publisher DOI: | 10.1103/PhysRevMaterials.2.053603 |
| Abstract: | The beryllides MBe13 (M = rare earths and actinides) crystallize in a NaZn13-type cubic structure, which can be categorized as a cage-structured compound. In this study, powder X-ray diffraction measurements have been performed on LaBe13, SmBe13, and UBe13 in the temperature range between 7 and 300 K in order to investigate their crystallographic characteristics systematically. They keep the NaZn13-type cubic structure down to the lowest temperature. We estimated their Debye temperature to be 600–750 K from analyses of the temperature dependence of a lattice parameter, being in good agreement with the values reported previously. Rietveld refinements on the obtained powder patterns revealed that the M atom in the 8a site is located in an almost ideal snub cube formed by 24 Be(II) atoms in the 96i site, whose caged structure is unchanged even at the low temperatures. In addition, it is argued from the temperature variation of an isotropic mean-square displacement parameter that the MBe13 compounds commonly have a low-energy phonon mode, which can be described by a model assuming an Einstein oscillation of the M atom with a characteristic temperature of ~ 160 K. |
| Rights: | ©2018 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/71444 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日髙 宏之
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