Crystal structures and magnetic properties of the 6H-perovskites Ba3LnRu2O9 (Ln = Ce, Pr and Tb)

Yoshihiro Doi, Makoto Wakeshima, Yukio Hinatsu, Aya Tobo, Kenji Ohoyama, Yasuo Yamaguchi

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50 Citations (Scopus)


Magnetic properties of quaternary oxides Ba3LnRu2O9 (Ln = Ce, Pr and Tb) are reported. These compounds adopt the 6H-perovskite structure with space group P63/mmc, in which the cation sites within the face-sharing octahedra are occupied by Ru ions and those within the corner-sharing octahedra are occupied by Ln ions. The oxidation states of both Ru and Ln ions were found to be tetravalent. These compounds are semiconductors over the temperature range 100-400 K. Measurements of the magnetic susceptibility and specific heat were carried out. The Ln4+ antiferromagnetic transition occurred at 9.5 K for Ln = Tb and 10.5 K for Ln = Pr. Powder neutron diffraction measurements for Ba3TbRu2O9 were performed at 2 and 15 K, and at room temperature. It was found that Ba3TbRu2O9 has a long range antiferromagnetic ordering of Tb4+ ions at 2 K. The moments of the Tb4+ ions order ferromagnetically in the c plane, and these ferromagnetic planes are stacked antiferromagnetically along the c axis. The direction of the ordered moments is parallel to the c axis, and the ordered magnetic moment of the Tb4+ ions is 6.84(4) μB.

Original languageEnglish
Pages (from-to)3135-3140
Number of pages6
JournalJournal of Materials Chemistry
Issue number12
Publication statusPublished - 2001 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry


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