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The Crystal Structure of Ba3CuRu2O9 and Comparison to Ba3MRu2O9 (M=In, Co, Ni, and Fe)

✍ Scribed by J.T. Rijssenbeek; Q. Huang; R.W. Erwin; H.W. Zandbergen; R.J. Cava

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 462 KB
Volume: 146
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8309

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✦ Synopsis

The crystal structure of Ba 3 CuRu 2 O 9 , determined by powder neutron di4raction, is reported for temperatures of 18+295 K. Structural re5nements by powder neutron di4raction for the previously reported compounds Ba 3 M Ru 2 O 9 for M ‫؍‬ Fe, Co, Ni, and In are also reported. All structures consist of pairs of face-shared RuO 6 octahedra interconnected by corner-sharing MO 6 octahedra. For Ba 3 Cu Ru 2 O 9 , Jahn+Teller distortion of the CuO 6 octahedra leads to an orthorhombic symmetry structure of space group Cmcm with a ‫؍‬ 5.6723(1), b ‫؍‬ 10.1722(3), and c ‫؍‬ 14.1575(3) A s at 295 K. For Ba 3 FeRu 2 O 9 , site occupancy disorder is found. Magnetic ordering is observed below 100, 105, and 110 K for M ‫؍‬ Cu, Ni, and Co, respectively. The magnetic structures at low temperatures for M ‫؍‬ Co and Ni are described and compared to previous reports.

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