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Title: Influence of complexing agent in Tl-containing sol-gel derived precursor on critical temperature enhancement of Tl0.5Pb0.5Sr1.8Yb0.2 CaCu2O7 superconductor
Authors: Marsom, E.S. 
Yahya, A.K. 
Hamid, N.A. 
Awang, Z. 
Hamadneh, I. 
Issue Date: 2008
Journal: Journal of Applied Sciences Volume 8, Issue 12, 2008, Pages 2312-2317 
Abstract: Superconducting oxide ceramics of composition Tl0.5Pb0.5Sr1.8Yb0.2CaCu 2O7 was prepared by using a single-step sol-gel process using two different complexing agents (tartaric acid and citric acid). The effect of the complexing agents (0.0-11.0% (w/w %)) on superconductivity of the samples were studied. It was found that the values of critical temperature, Tc zero, was enhanced from 88 K (for the sample without any complexing agents) to 95 K (for sample with 11 w/w % tartaric acid) and 97 K (for sample with 11 w/w% citric acid). SEM analysis showed formation of ultra-fine grains with 1-2 μm average grains size for the sample without complexing agents. Addition of the complexing agents induced growth of elongated grains of 5-10 μm in average length. The Tc enhancement was discussed in terms of changes in hole concentration and sample microstructure as a result of use of the complexing agents. © 2008 Asian Network for Scientific Information.
DOI: 10.3923/jas.2008.2312.2317
Appears in Collections:CFDS Scholarly Publication

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