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Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe13 (M = La, Sm, and U)

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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
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
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)

Submitter: 日髙 宏之

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