Synthesis and crystal structures of K5Se3, Cs5Te3 and Cs2Te
Synthesis and crystal structures of K5Se3, Cs5Te3 and Cs2Te
复制标题
K5Se3、Cs5Te3 和 Cs2Te 的合成和晶体结构
DOI：
10.1524/zkri.1991.196.14.137
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Böttcher
中科院分区：
文献类型：
--
作者：
I. Schewe;P. Böttcher
介绍了KsSca、CssTcs和Cs2Te的合成及其晶体结构。低温-(LT-)K5Se3的亚结构通过单晶x射线分析得到(a = 18.289(3) Ä， 6 = 5.861(2) Ä， c = 12.988(2) k， ß = 134.82(1)°，Z = 4, C2/ot)；它是kstcs型的单斜畸变，它本身与wjsis型密切相关。此外，我们还提出了ltksss的不相称上层结构模型，该模型再现了观测卫星的主要特征。通过粉末x -射线衍射确定高温的结构(HT) -K5Se3 (KsTej-type:细胞常数在200°C: a = 13.097 (1), C = 5.882 (1), Z = 4 / 4 / w), CsjTea (LT-KjSea-type: = 21.11 (2), b = 6.655 (1) a, C = 15.07 (l)、^ = 134.53(5)°,Z = 4, C2 / m),和Cs ^ Te (PbClz-type: = 9.109 (2) = 5.871 (1) a, C = 11.494 (2), Z = 4, Pnma),额外的thermoanalytic方法,我们调查了相变LT-KjSes HT-KsSea。
We describe the syntheses and the crystal structures of KsSca, CssTcs, and Cs2Te. The substructure of low-temperature-(LT-)K5Se3 was solved by single crystal X-ray analysis (a = 18.289(3) Ä, 6 = 5.861(2) Ä, c = 12.988(2) k , ß = 134.82(1)°, Z = 4, C2/ot); it is a monoclinic distortion of the KsTcs-type, which itself is closely related to the WjSis-type. Furthermore, we propose a model for the incommensurate superstructure of LTKsSes, which reproduces the main features of the observed satellites. By X-ray powder diffraction we determined the structures of high-temperature(HT)-K5Se3 (KsTej-type: cell constants at 200°C: a = 13.097(1) Ä, c = 5.882(1) Ä, Z = 4, /4/w), CsjTea (LT-KjSea-type: a = 21.11(2) Ä, b = 6.655(1)Ä, c = 15.07(l)Ä, ^ = 134.53(5)°, Z = 4, C2/m), and Cs^Te (PbClz-type: a = 9.109(2) Ä, = 5.871(1) Ä, c = 11.494(2) Ä, Z = 4, Pnmä), and, with additional thermoanalytic methods, we investigated the phase transition LT-KjSes HT-KsSea.