Synthesis, crystal structures, and magnetic properties of new 12L-perovskites Ba4LnRu3O12 (Ln = lanthanides)

Yuki Shimoda, Yoshihiro Doi, Yukio Hinatsu, Kenji Ohoyama

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Abstract

Synthesis, crystal structures, and magnetic properties of new quaternary oxides Ba4LnRu3O12 (Ln = lanthanides) were investigated. From the powder X-ray and neutron diffraction measurements, it is found that they adopt the 12L-perovskite-type structures consisting of Ru 3O12 trimers and LnO6 octahedra. The Ba 4LnRu3O12 for Ln = Tb-Lu have a hexagonal unit cell with the space group R3̄m, while those for Ln = La-Nd, Sm-Gd have a monoclinically distorted cell with C2/m. Only for Ln = Ce, Pr, and Tb compounds, the Ln ions are in the tetravalent state. The magnetic properties of these three compounds were investigated. For Ba4CeRu3O 12, no magnetic transition was observed down to 0.5 K. The Ba 4PrRu3012 and Ba4TbRu 3O12 show an antiferromagnetic transition at 2.4 and 24 K, respectively. The magnetic structure for Ba4TbRu3O 12 was determined by powder neutron diffraction measurements at low temperatures, which indicates the long-range antiferromagnetic ordering.

Original languageEnglish
Pages (from-to)4512-4518
Number of pages7
JournalChemistry of Materials
Volume20
Issue number13
DOIs
Publication statusPublished - 2008 Jul 8

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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