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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Synthesis, crystal structure and magnetic properties of Na3OsO5
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Synthesis, crystal structure and magnetic properties of Na3OsO5

机译:Na3OsO5的合成,晶体结构和磁性

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Na3OSO5 has been synthesized by solid state reaction of Na2O2 and osmium powder under a flow of oxygen. Na3OSO5 crystallizes trigonal in space group P3(1)21 with a = 5.5529(2) angstrom, c = 13.4726(8) angstrom, V = 359.77(3) angstrom(3), Z = 3, 958 independent reflections, R-1 = 1,97 %, wR(2) =4.27%. The crystal structure consists Of OSO5 trigonal bipyramids separated by sodium cations, and is isostructural to Na3ReO5. The osmium atoms adopt a packing analogous to ccp, where Na occupies the octahedral and tetrahedral vacancies, so the cation structure is derived from the Li3Bi structure type. Features of the synthesis of Na3OsO5 and related osmates are discussed. Na3OsO5 shows paramagnetic behaviour down to 25 K where it orders antiferromagnetically. Below 7 K a weak ferromagnetic contribution is detected. The paramagnetic region of the 5d(1) system has been successfully described in the temperature range 50-330 K accounting for strong spin-orbit coupling, ligand-field potential of D-3h symmetry (corresponding to the trigonal bipyramidal OSO53- unit), and cooperative magnetic effects (molecular field parameter lambda(MF)).
机译:通过在氧气流下Na 2 O 2和粉的固相反应合成了Na 3 OSO 5。 Na3OSO5在空间组P3(1)21中结晶为a = 5.5529(2)埃,c = 13.4726(8)埃,V = 359.77(3)埃(3),Z = 3,958个独立反射,R-1 = 1.97%,wR(2)= 4.27%。晶体结构由被钠阳离子分隔的OSO5三角双锥体组成,并且与Na3ReO5同构。原子采用类似于ccp的堆积,其中Na占据八面体和四面体空位,因此阳离子结构衍生自Li3Bi结构类型。讨论了Na3OsO5的合成特征和相关的渗透酸。 Na3OsO5表现出低至25 K的顺磁行为,在该行为中反铁磁有序。在7 K以下,检测到弱的铁磁贡献。已经成功地描述了5d(1)系统的顺磁区域,其温度范围为50-330 K,这说明了强自旋轨道耦合,D-3h对称性的配体场势(对应于三角双锥体OSO53-单元),和协同磁效应(分子场参数lambda(MF))。

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