Structural Chemistry and Magnetic Properties of the BaMn0.4Co0.6O2.83 Hexagonal Perovskite

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• 作者：L. Miranda ; J. Ram&iacute ; rez-Castellanos ; A. Varela ; J. Gonzá ; lez-Calbet ; M. Parras ; Mar&iacute ; a Hernando ; M. T. Ferná ; ndez-D&iacute ; az ; M. Garc&iacute ; a Herná ; ndez
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：March 20, 2007
• 年：2007
• 卷：19
• 期：6
• 页码：1503 - 1508
• 全文大小：343K
• 年卷期：v.19,no.6(March 20, 2007)
• ISSN：1520-5002

文摘

The complete structural characterization of the hexagonal cobaltite BaMn_0.4Co_0.6O_2.83 has been performedby combining high-resolution transmission electron microscopy and electron and neutron diffraction.The structure is closely related to the 12H (cc'chhh)₂ with oxygen deficient cubic c'-BaO₂ layers. Thisframework forms a laminar structure in which tetramers of face-sharing octahedra occupied by manganeseand cobalt are connected by corners to two tetrahedral layers mostly occupied by cobalt. A magneticstudy shows only the presence of short-range magnetic interactions indicating that there are no interactionsbetween the tetramers through the tetrahedral layers, thus impeding the three-dimensional magnetic orderingof the system. A spin-glass-like state was found to be compatible with the observed phenomenology.