Structural investigations of ACu3Ru4O12 (A=Na, Ca, Sr, La, Nd) -: A comparison between XRD-Rietveld and EXAFS results

被引:58
作者
Ebbinghaus, SG
Weidenkaff, A
Cava, RJ
机构
[1] Univ Augsburg, Inst Phys, D-86159 Augsburg, Germany
[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
关键词
EXAFS; Rietveld structure refinements; perovskites; cuprates; ruthenates;
D O I
10.1006/jssc.2002.9634
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The structures of five perovskite-related oxides with the general composition A Cu3Ru4O12 with A = Na, Ca, Sr, La and Nd, have been examined both by XRD-Rietveld refinements and Ru-K EXAFS-spectroscopy. In addition, the behavior on reduction was investigated by thermogravimetry (TG). The TG measurements revealed that the composition was almost exactly A(1)Cu(3)Ru(4)O(12) for all samples. The inter-atomic distances derived from EXAFS- and XRD-Rietveld fits show an excellent agreement with differences smaller than 8 mAngstrom even for R > 5 Angstrom All inter-atomic distances increase in the order Na<Ca<Sr<Nd<La and were found to depend linearly on the product of charge and ionic radius of the A-cation. The experimentally found distances are compared with the corresponding values expected from bond-valence calculations. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:126 / 136
页数:11
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