Structural Chemistry and Magnetic Properties of Incommensurate Sr1+x(CoxMn1-x)O<

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• 作者：Nicola A. Jordan ; Peter D. Battle ; Sander van Smaalen ; and Markus Wunschel
• 刊名：Chemistry of Materials
• 出版年：2003
• 出版时间：November 4, 2003
• 年：2003
• 卷：15
• 期：22
• 页码：4262 - 4267
• 全文大小：150K
• 年卷期：v.15,no.22(November 4, 2003)
• ISSN：1520-5002

文摘

The incommensurate, modulated crystal structures of Sr_1+x(Co_xMn_1-x)O₃ (x mages/entities/ap.gif"> 0.266 and0.280) have been refined by a (3+1)D superspace profile analysis of neutron powder diffractiondata. The structures are related to the 2H perovskite structure and consist of two subsystems,[Co_xMn_1-xO₃]_{mages/entities/infin.gif">} chains containing face-sharing MnO₆ octahedra and CoO₆ trigonal prisms(albeit with some cation site inversion), separated from each other by [Sr]_{mages/entities/infin.gif">} chains. Theobserved structures are closely related to those expected for the idealized compositions Sr₁₄Co₃Mn₈O₃₃ and Sr₉Co₂Mn₅O₂₁. Both of the compositions investigated show hysteresis in theirmagnetic behavior below 13 K.