Structure and magnetism of NaRu2O4 and Na2.7Ru4O9期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Structure and magnetism of NaRu₂O₄ and Na_2.7Ru₄O₉

Authors:	K.A. Regan Q. Huang A.P. Ramirez

Affiliation:	^a Department of Chemistry, Princeton University, Princeton, NJ 08544, USA ^b NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ^c Department of Physics, Princeton University, Princeton, NJ 08544, USA ^d Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA

Abstract:	The structures of NaRu₂O₄ and Na_2.7Ru₄O₉ are refined using neutron diffraction. NaRu₂O₄ is a stoichiometric compound consisting of double chains of edge sharing RuO₆ octahedra. Na_2.7Ru₄O₉ is a non-stoichiometric compound with partial occupancy of the Na sublattice. The structure is a mixture of single, double and triple chains of edge-shared RuO₆ octahedra. NaRu₂O₄ displays temperature independent paramagnetism with . Na_2.7Ru₄O₉ is paramagnetic, χ₀= with and a Curie constant of 0.0119 emu/mol Oe K. Specific heat measurements reveal a small upturn at low temperatures, similar to the upturn observed in La₄Ru₆O₁₉. The electronic contribution to the specific heat (γ) for Na_2.7Ru₄O₉ was determined to be15 mJ/mole_Ru K².

Keywords:	Ruthenate Bronze NaRu₂O₄ Na_2.7Ru₄O₉ Ferrite Paramagnetic
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