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Crystal Structures and Magnetic Properties of 6H-Perovskites Ba3MRu2O9 (M=Y, In, La, Sm, Eu, and Lu)

✍ Scribed by Yoshihiro Doi; Kazuyuki Matsuhira; Yukio Hinatsu

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 309 KB
Volume: 165
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2002.9538

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✦ Synopsis

Magnetic properties of quaternary oxides Ba 3 MRu 2 O 9 (M ‫؍‬ Y, In, La, Sm, Eu, and Lu) are reported. Rietveld analyses of the X-ray di4raction data indicate that they adopt the 6Hperovskite structure and have the valence state of Ba 3 M 3؉ Ru 4.5؉ 2 O 9 . All compounds are nonmetallic at least over the temperature range of 100+400 K. The magnetic susceptibilities show a broad maximum at 135+370 K except for the La compound, which shows a plateau around 22 K. In addition, another magnetic anomaly is observed at 4.5+12.5 K by the magnetic susceptibility and speci5c heat measurements for any compound. It is considered that this magnetic behavior is ascribed to the antiferromagnetic coupling between two Ru ions in a Ru 2 O 9 dimer and to the magnetic interaction between the Ru 2 O 9 dimers.

2002 Elsevier Science (USA)

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