Zn3 and Ga3 Triangles as Building Units in Sr2Au6Zn3 and Sr2Au6Ga3

被引:28
作者
Gerke, Birgit [1 ,2 ]
Hoffmann, Rolf-Dieter [1 ,2 ]
Poettgen, Rainer [1 ,2 ]
机构
[1] Univ Munster, Inst Anorgan & Analyt Chem, D-48149 Munster, Germany
[2] Univ Munster, NRW Grad Sch Chem, D-48149 Munster, Germany
来源
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2013年 / 639卷 / 14期
关键词
Gallium; Zinc; Crystal structure; CRYSTAL-STRUCTURE; MAGNETIC-PROPERTIES; X-RAY; OCTAGALLIDE; GALLIUM; CA;
D O I
10.1002/zaac.201300366
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The intermetallic compounds Sr2Au6.52Zn2.48, Sr2Au6Zn3, and Sr2Au6Ga3 were obtained by induction melting of the elements in sealed tantalum tubes. Their structures were studied by X-ray diffraction on powders and refined from single crystal diffraction data: R http://www.w3.org/1999/xlinkc, a = 844.5(2), c = 2187.7(5) pm, wR(2) = 0.0411, 936 F-2 values and 20 variables for Sr2Au6.52Zn2.48; a = 841.6(2), c = 2191.5(7) pm, wR(2) = 0.0126, 587 F-2 values and 19 variables for Sr2Au6Zn3; and a = 841.9(2), c = 2191.1(7) pm, wR(2) = 0.0199, 660 F-2 values and 19 variables for Sr2Au6Ga3. The gold substructures of Sr2Au6Zn3 and Sr2Au6Ga3 can be considered as diamond polytypes with 6R stacking sequences (287-304 pm Au-Au in Sr2Au6Zn3). The cavities formed by this network are filled in an ordered manner by strontium atoms and Zn-3 (281 pm Zn-Zn), respectively Ga-3 (286 pm Ga-Ga) triangles in a 2:1 ratio. Consequently one can describe the Sr2Au6Zn3 and Sr2Au6Ga3 structures as ordered substitution variants of the Zintl phase CaIn2. This structural relationship is discussed on the basis of a group-subgroup Scheme. Sr2Au6.52Zn2.48 shows Zn/Au mixing on the triangle.
引用
收藏
页码:2444 / 2449
页数:6
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