Abstract

Crystals of new iodate Na₃Fe[IO₃]₆ were prepared by the hydrothermal synthesis (the unit cell parameters a = 6.6886(2) Å, b = 6.7756(3) Å, c = 10.1396(6) Å, α = 74.590(4)°, β = 71.510(4)°, γ = 79.960(4)°; sp. gr. P\(\bar {1}\), R = 2.7%). The new compound belongs to the family containing the {M[IO₃]₆} structural unit (M = Ti, Ge, In, Pt, Fe³⁺). The latter is composed of a MO₆ octahedron sharing vertices with six [IO₃]^– groups. The Na₃Fe[IO₃]₆ structure is the first one, in which an octahedral M site is occupied by Fe³⁺ cations. The Na atoms are distributed over two sites between the {Fe[IO₃]₆}^3– units and are located in oxygen octahedra. A comparison of the new structure with Rb₃In[IO₃]₆ showed that inversion centers are differently occupied by alkali metals Na and Rb.

中文翻译：

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A 3 M [IO 3] 6结构族的新碘化物Na 3 Fe [IO 3] 6的合成和晶体结构（A = Na，K，Rb，Cs，Tl； M = Ti，Fe，Ge，In，铂）

摘要

通过水热合成制备新的碘酸盐Na ₃ Fe [IO ₃ ] ₆晶体（晶胞参数a = 6.6886（2）Å，b = 6.7756（3）Å，c = 10.1396（6）Å，α= 74.590 （4）°，β= 71.510（4）°，γ= 79.960（4）°; SP克P \（\巴{1} \）， - [R = 2.7％）。新化合物属于含有{ M [IO ₃ ] ₆ }结构单元的族（M = Ti，Ge，In，Pt，Fe ³⁺）。后者由一个M O ₆八面体与六个[IO ₃] ^–组。Na ₃ Fe [IO ₃ ] ₆结构是第一个结构，其中八面体M位点被Fe ³⁺阳离子占据。Na原子分布在{Fe [IO ₃ ] ₆ } ^3–单元之间的两个位置上，位于氧八面体中。将新结构与Rb ₃ In [IO ₃ ] _{6进行比较}表明，碱金属Na和Rb占据了不同的反型中心。