ON DIALKALI METAL DICHALCOGENIDES BETA-NA2S2, K2S2, ALPHA-RB2S2, BETA-RB2S2, K2SE2, RB2SE2, ALPHA-K2TE2, BETA-K2TE2 AND RB2TE2

被引：89

作者：

BOTTCHER, P ^{[1
]}

GETZSCHMANN, J ^{[1
]}

KELLER, R ^{[1
]}

机构：

[1] HOECHST AG,WERK KNAPSACK,W-5030 HURTH,GERMANY

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 1993年 / 619卷 / 03期

关键词：

DIALKALI METAL DICHALCOGENIDES; PREPARATION; CRYSTAL STRUCTURE;

D O I：

10.1002/zaac.19936190309

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The first presentation of pure samples of alpha-and beta-Rb2S2, alpha- and beta-K2Te2, and Rb2Te2 is described. Using single crystals of K2S2 and K2Se2, received by ammonothermal synthesis, the structure of the Na2O2 type and by using single crystals of beta-Na2S2 and beta-K2Te2 the Li2O2 type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na2O2 type to the Li2O2 type will be explained by means of the examples alpha-/beta-Na2S2 and alpha-/beta-K2Te2. A further case of dimorphic condition as well as the monotropic phase transition of alpha- and beta-Rb2S2 is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence.

引用

页码：476 / 488

页数：13

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