Study on the crystal structure of the rare earth oxyborate Yb26B12O57 from powder X-ray and neutron diffraction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Min Yang
  • Kuo Li
  • Jie Su
  • Q. Huang
  • Liping You
  • Zhaofei Li
  • Yingxia Wang
  • Yu Jiang
  • Fuhui Liao
  • Jianhua Lin

Detail(s)

Original languageEnglish
Pages (from-to)4707-4713
Journal / PublicationJournal of Alloys and Compounds
Volume509
Issue number14
Online published22 Jan 2011
Publication statusPublished - 7 Apr 2011
Externally publishedYes

Abstract

Yb26B12O57 , a rare earth oxyborate previously assigned as Yb3BO6 , has been studied by various techniques including neutron and X-ray diffraction, 11B NMR spectroscopy, electron diffraction and high angle angular dark field-scanning transmission electron microscopy (HADDF-STEM). It crystallizes in the space group C2/m with cell parameters of a = 24.5780(4) Å, b = 3.58372(5) Å, c = 14.3128(3) Å and β = 115.079(1)°. The structure consists of slabs of rare earth sesquioxide and borate groups. The sesquioxide part is identified from the structural refinement, and is observed from HADDF-STEM image, while elucidation of borate groups is not straightforward. An additional oxygen atom (O31), which links two B2O5 groups into a B4O11 polyanion, is identified from the analysis of neutron diffraction data. The occupancy of this oxygen site is only quarter, which results in a random distribution of B4O11 and B2O5 groups along the b-direction. The chemical formula of ytterbium oxyborate is Yb26(BO3)4(B2O5)2(B4O11)O24, instead of the simple stoichiometric formula Yb3BO6 . This compound is paramagnetic but its susceptibility deviated from the Curie-Weiss law at low temperature.

Research Area(s)

  • Composition fluctuations, Crystal structure, Neutron diffraction, Rare earth alloys and compounds, Transmission electron microscopy, X-ray diffraction

Citation Format(s)

Study on the crystal structure of the rare earth oxyborate Yb26B12O57 from powder X-ray and neutron diffraction. / Yang, Min; Li, Kuo; Su, Jie; Huang, Q.; Bao, Wei; You, Liping; Li, Zhaofei; Wang, Yingxia; Jiang, Yu; Liao, Fuhui; Lin, Jianhua.

In: Journal of Alloys and Compounds, Vol. 509, No. 14, 07.04.2011, p. 4707-4713.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review