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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >A fluoride phosphate of manganese(III) with unusual layer structure: Na-7[Mn5F13(PO4)(3)(H2O)(3)] [German]
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A fluoride phosphate of manganese(III) with unusual layer structure: Na-7[Mn5F13(PO4)(3)(H2O)(3)] [German]

机译:具有异常层结构的锰(III)的磷酸氟磷酸盐:Na-7 [Mn5F13(PO4)(3)(H2O)(3)] [德语]

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摘要

The title compound was crystallized from a solution of MnF3 .3H2O in aqueous HF by addition of NaH2PO4 . H2O in 2 M phosphoric acid. The crystal structure has been determined at 295 and 150 K on a trigonal crystal twinned by merohedry: Space group c1, Z = 4, a = 1055,0(1), c = 2314,0(1) pm (a = 1052,5(1), c = 2304,2(1) pm at 150 K), wR(2) = 0.0651 (0.0651). The structure contains anionic layers formed by triangular moieties of three [MnF3O2(H2O)] octahedra sharing one common mu(3)-F atom and bridged by three phosphate groups. Three of those groups, respectively, are interconnected by two [MnF3O3] octahedra over six phosphate O-atoms to form a trigonal layer in the a,b plane. Stacking of these layers gives channels along the c axis in which most of the Na+ ions are located. The [MnF3O2(H2O)] octahedra show strong elongation along the mu(3)-F-Mn-OH2 axis mainly due to the Jahn-Teller effect whereas in the [MnF3O3] octahedra with C-3 symmetry weak signs only of a dynamical Jahn-Teller-effect can be observed. The magnetic properties (mu(eff) = 4.61 mu(B), 3-D ordering point T-N = 3.3 K) were determined on powders and possible magnetic exchange pathways are discussed. [References: 19]
机译:通过加入NaH2PO4,从MnF3.3H2O在HF水溶液中的结晶中结晶出标题化合物。在2 M磷酸中的H2O。晶体结构已确定为在295和150 K上通过亮光双晶孪晶形成的三角形晶体:空间群 c1,Z = 4,a = 1055,0(1),c = 2314,0( 1)pm(在150 K时a = 1052,5(1),c = 2304,2(1)pm),wR(2)= 0.0651(0.0651)。该结构包含由三个[MnF3O2(H2O)]八面体的三角形部分形成的阴离子层,它们共享一个公共的mu(3)-F原子并由三个磷酸基团桥接。这些基团中的三个分别通过两个[MnF3O3]八面体在六个磷酸盐O原子上互连,从而在a,b平面中形成三角层。这些层的堆叠提供了沿c轴的通道,其中大部分Na +离子位于该通道中。 [MnF3O2(H2O)]八面体在mu(3)-F-Mn-OH2轴上显示出很强的伸长率,这主要归因于Jahn-Teller效应,而在具有C-3对称性的[MnF3O3]八面体中,只有动态的弱符号可以观察到Jahn-Teller效应。在粉末上测定了磁性(μ(eff)=4.61μ(B),3-D有序点T-N = 3.3K),并讨论了可能的磁交换路径。 [参考:19]

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