High pressure synthesis and crystal structure of Nd4Au2O9 and Gd4Au2O9

被引：6
作者：
Steiner, C [1 ]
Andratschke, M [1 ]
Range, KJ [1 ]
机构：
[1] UNIV REGENSBURG,INST ANORGAN CHEM,D-93053 REGENSBURG,GERMANY
来源：
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 1996年 / 51卷 / 06期
关键词：
lanthanoide aurates(III); high-pressure synthesis; crystal structure; columnar stacking;
D O I：
10.1515/znb-1996-0609
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Single crystals of Nd4Au2O9 and Gd(4)AU(2)O(9) have been prepared by oxidizing mixtures of gold metal and Nd2O3 or Gd2O3, rsp., with KO2 under high-pressure high-temperature conditions (40 kbar, 1200 degrees C) in a modified Belt-type apparatus. The X-ray structure analyses have been carried out on twinned crystals. The compounds crystallize:ln the orthorhombic space group Pbcn (Nd4Au2O9: a = 11.938(7), b = 6.126(2), c = 11.928(3) Angstrom, Z = 4, R1 = 0.0443; Gd4Au2O9: a = 11.922(2), b = 6.1242(7), c = 11.917(2) Angstrom, Z = 4, R1 = 0.0232). The title compounds are isostructural with La4Au2O9. Their structure comprises isolated square-planar AuO4 groups, stacked along [010] to form a columnar structure. The Au-Au distance along the columnar direction is 3.10 Angstrom. Structural relations to Bi2CuO4 and (Nd,Pr)(2)AuO5 are discussed.
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页码：811 / 816
页数：6
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