Synthesis, structure and properties of Ag2PdO2

被引:26
作者
Schreyer, M
Jansen, M
机构
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Univ Bonn, Inst Anorgan Chem, D-53121 Bonn, Germany
关键词
silver palladium oxide; solid-slate structures; high pressure synthesis; neutron diffraction; x-ray diffraction; rietveld refinement;
D O I
10.1016/S1293-2558(00)01128-6
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The first silver palladium oxide, Ag2PdO2, was synthesised from a co-precipitated oxide precursor by annealing at 423-823 K, applying an oxygen pressure of 73 MPa. The crystal structure has been determined from X-ray and neutron powder diffraction data. The new compound crystallises in space group Immm. The lattice constants as determined from X-ray powder diffraction are a = 4.55523(5) Angstrom, b = 3.00803(3) Angstrom and c = 9.8977(1) Angstrom. The crystal structure constitutes a new structure type showing some features in common with the Li2CuO2-type. Palladium is found in a nearly square planar arrangement while silver has an almost linear co-ordination. The overall structure can be considered as a rocksalt defect structure. Ag2PdO2 is diamagnetic and semiconducting. The band gap, estimated from conductivity measurements in the temperature range of 240-300 K, is 0.18(2) eV. (C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
引用
收藏
页码:25 / 30
页数:6
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