Acentric Pseudo-Kagome Structures: The Solid Solution (Co1鈥?i>xNix)3Sb4O6F6

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• 作者：Shichao Hu ; Mats Johnsson ; Peter Lemmens ; Daniel Schmid ; Dirk Menzel ; Joshua Tapp ; Angela M枚ller
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：June 24, 2014
• 年：2014
• 卷：26
• 期：12
• 页码：3631-3636
• 全文大小：322K
• ISSN：1520-5002

文摘

Compounds within the solid solution (Co_1鈥?i>xNi_x)₃Sb₄O₆F₆ were prepared by the hydrothermal method. The compounds crystallize in the noncentrosymmetric cubic space group I 4虆3m with unit cell parameters a = 8.176(1) 脜 for M = Co and a = 8.0778(1) 脜 for M = Ni. The crystal structure is made up by corner sharing [MO₂F₄] octahedra via the fluorine atoms. [Sb₄O₆E₄] supertetrahedra (T2) consisting of four [SbO₃E] groups (E being the stereochemically active lone-pair on Sb) that share O atoms with the [MO₂F₂]_n network. Magnetic ordering phenomena are observed with two characteristic temperatures, T_N and T*, in the range from 67 to 170 K, that evolve gradually with composition and collapse for M = Co (x = 0) to one transition. T_N is assigned to a transition into a long-range ordered antiferromagnetic phase, and T* marks a temperature in the range of 45 to 65 K where field cooled (FC) and zero field cooled (ZFC) susceptibility splits. The latter is tentatively attributed to a canting of the spin moments.