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首页> 外文期刊>Physica, C. Superconductivity and its applications >Effect of Fe substitution in the structure and superconducting properties of the (Y0.8Pr0.2)Ba2Cu4-xFexO8 system
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Effect of Fe substitution in the structure and superconducting properties of the (Y0.8Pr0.2)Ba2Cu4-xFexO8 system

机译：铁取代对（Y0.8Pr0.2）Ba2Cu4-xFexO8体系的结构和超导性能的影响

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The effects of iron substitutions on the superconducting and structural properties of (Y0.8Pr0.2)Ba(2)Cu(4-x)FexO(8) were studied. As iron concentration increases, the rate,at which T. diminishes with x is the same as for the YBa2Cu4-xFexO8 system, but faster than in the YBa2Cu3-xFexO7-delta system. The Mossbauer spectra of the different samples, together with Rietveld refinements of their corresponding X-ray spectra, indicate that the iron atoms occupy preferably the Cu(1) sites of the double (CuO)(2) chains in fivefold coordination; that is, due to their tri-valency, the iron atoms attract extra oxygen atoms, named O(5), that place themselves along the a-axis in between two adjacent planes of the double (CuO)(2) chains. As x is increased, the Cu(1)-O(4) bond length decreases, whereas the Cu(2)-O(4) one increases. Also, a reduction of the occupation factors of the oxygen atoms in the CuO2 planes is observed. Some of these changes may be due to the presence of O(5) atoms, which in turn affect the charge-transfer mechanism between the (CuO)(2) double chains and the CuO2 planes where superconductivity takes place, and could be responsible of the rate at which T-c decreases. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 41]
机译：研究了铁取代对（Y0.8Pr0.2）Ba（2）Cu（4-x）FexO（8）的超导和结构性能的影响。随着铁浓度的增加，T随x减小的速率与YBa2Cu4-xFexO8系统相同，但比YBa2Cu3-xFexO7-δ系统快。不同样品的Mossbauer光谱及其相应的X射线光谱的Rietveld精炼表明，铁原子优选以五重配位形式占据双（CuO）（2）链的Cu（1）位。也就是说，由于它们的三价，铁原子吸引了额外的氧原子，称为O（5），它们沿a轴放置在双（CuO）（2）链的两个相邻平面之间。随着x的增加，Cu（1）-O（4）的键长减小，而Cu（2）-O（4）的键长增加。而且，观察到了CuO 2平面中氧原子的占据因子的减少。其中一些变化可能是由于O（5）原子的存在，这反过来又影响了（CuO）（2）双链和发生超导的CuO2平面之间的电荷转移机制，并且可能是由于Tc降低的速率。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：41]

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