THE SYNTHESIS OF NEW PHASES RELATED TO YBCO BY COMPLETE REPLACEMENT OF THE CHAIN COPPER SITES

被引：23

作者：

GREAVES, C

SLATER, PR

机构：

[1] School of Chemistry, University of Birmingham, England

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

Ceramic Materials - Superconductivity - Europium Compounds - Superconductivity - X-Rays - Diffraction - Yttrium Compounds - Superconductivity;

D O I：

10.1109/20.133392

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The extent to which new phases may be synthesised by the replacement of the chain Cu sites (Cu 1) in the YBa2Cu3O7 structure has been examined. Several new phases have been prepared, and it is demonstrated that for cations which preferentially substitute at this site, it becomes possible to prepare phases in which the Ba cations have been totally replaced by Sr, e.g. EuSr2Cu2NbO8. All phases of this type are tetragonal, and using Rietveld refinement techniques and powder X-ray diffraction data, it has been confirmed that the Nb occupies only the Cu 1 position and adopts octahedral coordination in EuSr2Cu2NbO8. Phases involving other substituting cations are also discussed. Superconductivity has not been observed in these phases.

引用

页码：1174 / 1177

页数：4

共 10 条

[1] BOND-VALENCE PARAMETERS OBTAINED FROM A SYSTEMATIC ANALYSIS OF THE INORGANIC CRYSTAL-STRUCTURE DATABASE [J].