Order-disorder (OD) structures of Rb2Zn(TeO3)(CO3)·H2O and Na2Zn2Te4O11

IF 0.9 4区材料科学 Q3 CRYSTALLOGRAPHY

Zeitschrift Fur Kristallographie-Crystalline Materials Pub Date : 2022-07-13 DOI:10.1515/zkri-2022-0030

F. Eder, B. Stöger, M. Weil

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引用次数: 4

Abstract

Abstract Single crystals of the two alkali metal zinc oxidotellurates(IV), Rb2Zn(TeO3)(CO3)·H2O and Na2Zn2Te4O11, were obtained by reactions of mixtures of ZnO, TeO2, Rb2CO3 (molar ratios 2:3:6) and ZnO, TeO2, Na2CO3 (molar ratios 2:3:10), respectively, with small amounts of water as a mineralizer. Both compounds crystallize as order-disorder (OD) structures of layers and feature a high stacking fault probability. The crystal structure of Rb2Zn(TeO3)(CO3)·H2O is composed of layers extending parallel to (100). The structure is composed of two kinds of non-polar OD layers consisting of trigonal-pyramidal [TeO3]2−, tetrahedral [ZnO4]6−, Rb1+, and CO32−, H2O, Rb2+, respectively. Different centrings of the layer groups lead to an ambiguity in the stacking arrangement. The crystal structure of Na2Zn2Te4O11 is built from layers extending parallel to (001). Trigonal-pyramidal [TeO3]2− and bisphenoidal [TeO4]4− polyhedra form [Te4O11]6− groups, which are connected by longer Te–O-contacts to form 1∞[Te8O22]12− double chains oriented along either [100] or [010]. These chains form non-polar layers, which appear alternatingly in two orientations related by a fourfold rotoinversion. The Zn2+ and Na+ cations are located at the layer interface. The stacking ambiguity is due to different lattices of adjacent layers.

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Rb2Zn(TeO3)(CO3)·H2O和Na2Zn2Te4O11的有序无序(OD)结构

摘要通过ZnO、TeO2、Rb2CO3（摩尔比2:3:6）和ZnO、TeO3、Na2CO3（摩尔比2:3:10）的混合物与少量水作为矿化剂反应，获得了两种碱金属氧化锌（IV）Rb2Zn（TeO3）（CO3）·H2O和Na2Zn2Te4O11的单晶。这两种化合物都以层的有序无序（OD）结构结晶，并具有较高的层错概率。Rb2Zn（TeO3）（CO3）·H2O的晶体结构由平行于（100）延伸的层组成。该结构由两种非极性OD层组成，分别由三角锥[TeO3]2−、四面体[ZnO4]6−、Rb1+和CO32-、H2O、Rb2+组成。层组的不同中心导致堆叠排列的模糊性。Na2Zn2Te4O11的晶体结构是由平行于（001）延伸的层构建的。三角锥[TeO3]2−和双酚[TeO4]4−多面体形成[Te4O11]6−基团，它们通过较长的Te-O接触连接，形成沿[100]或[010]取向的1∞[Te8O22]12−双链。这些链形成非极性层，它们交替出现在由四重旋转反转相关的两个方向上。Zn2+和Na+阳离子位于层界面处。堆叠的模糊性是由于相邻层的不同晶格造成的。

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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.