Na, K和Rb的混合价1:1氧化碲酸盐(IV/VI):上部结构和三维无序

IF 0.9 4区材料科学 Q3 CRYSTALLOGRAPHY

Zeitschrift Fur Kristallographie-Crystalline Materials Pub Date : 2022-11-03 DOI:10.1515/zkri-2022-0036

Hermann Völkl, F. Eder, B. Stöger, M. Weil

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引用次数: 0

摘要

摘要以M2CO3、TeO2和Te(OH)6为原料，在210℃水热条件下以4:1:1的摩尔比生长出三种分子式为M2TeIVTeVIO6 (H2O) x (M = Na, K, Rb)的混合价氧化碲酸盐(IV/VI)单晶。Na2Te2O6·11/8H2O(其中TeIVTeVI缩写为Te2)在水分子的职业调制下结晶为单斜八重超结构。该结构是由Na原子和H2O分子交织而成的双周期波纹状[Te2O6]2−网络。M2Te2O4(OH)4 (M = K, Rb;x = 2)具有P63/mmc对称性，由沿[001]方向延伸的[Te2O4(OH)4]2 -棒材组成。棒由M原子连接。[TeIVO2(OH)2]单元在三轴上无序，导致明显的三维漫射散射。

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Mixed-valent 1:1 oxidotellurates(IV/VI) of Na, K and Rb: superstructure and three-dimensional disorder

Abstract Single crystals of three mixed-valent oxidotellurates(IV/VI) with general formula M2TeIVTeVIO6 (H2O) x (M = Na, K, Rb) were grown under hydrothermal conditions at 210 °C from M2CO3, TeO2 and Te(OH)6 in a 4:1:1 molar ratio. Na2Te2O6·11/8H2O (where TeIVTeVI is abbreviated as Te2) crystallizes as a monoclinic eightfold superstructure with occupational modulation of the water molecules. The structure is built of diperiodic corrugated [Te2O6]2− networks interleaved by the Na atoms and H2O molecules. The hexagonal crystal structures of M2Te2O4(OH)4 (M = K, Rb; x = 2) with P63/mmc symmetry are made up of [Te2O4(OH)4]2− rods extending in the [001] direction. The rods are connected by the M atoms. The [TeIVO2(OH)2] units are disordered about the threefold axis, resulting in pronounced three-dimensional diffuse scattering.

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来源期刊

Zeitschrift Fur Kristallographie-Crystalline Materials CRYSTALLOGRAPHY-

CiteScore

2.00

自引率

16.70%

发文量

期刊介绍： Zeitschrift für Kristallographie – Crystalline Materials was founded in 1877 by Paul von Groth and is today one of the world’s oldest scientific journals. It offers a place for researchers to present results of their theoretical experimental crystallographic studies. The journal presents significant results on structures and on properties of organic/inorganic substances with crystalline character, periodically ordered, modulated or quasicrystalline on static and dynamic phenomena applying the various methods of diffraction, spectroscopy and microscopy.