Synthesis and crystal structure of beta-Rb2Te2 and Cs2Te2 as well as the refinement of the structure of Ca2P2 and Sr2As2

被引：0

作者：

Getzschmann, J ^{[1
]}

Bottcher, P ^{[1
]}

机构：

[1] UNIV DUSSELDORF,INST ANORGAN CHEM & STRUKTCHEM,D-40225 DUSSELDORF,GERMANY

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 1996年 / 211卷 / 02期

关键词：

crystal structure; rietveld refinement; Na2O2 type structure; Cs2Te2 type structure;

D O I：

暂无

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Two alkali metal tellurides, which crystallize with a new type of structure, are described: Cs2Te2 type, space group Pbam, Rietveld refinement of powder data (Cs2Te2: a = 11.629(2) Angstrom, b = 6.128(1) Angstrom, c = 4.960(1) Angstrom; beta-Rb2Te2: a = 11.151(1) Angstrom, b = 5.854(1) Angstrom, c = 4.821(1) Angstrom). This structure type may be described as a lower symmetric, distorted variant of the CsCl type. Furthermore we report the single crystal refinements of the structures of two alkaline earth pnicogenides M'Y-2(2)(Ca2P2,Sr2As2) in order to get exact information about the bond lengths of the Y-2(4-)-dumbbells. Due to the Na2O2 type of both structures, two crystallographic independent sites exist for the pnicogen atoms. Interestingly, in both compounds two different bond lengths of the two independent dumbells Y-2(4-) are found (Ca2P2: P-P: 2.268(8) Angstrom and 2.320(4) Angstrom; Sr2As2: As-As: 2.521(9) Angstrom and 2.574(5) Angstrom).

引用

页码：90 / 95

页数：6

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