Publication: Influence of complexing agent in Tl-containing sol-gel derived precursor on critical temperature enhancement of Tl0.5Pb0.5Sr1.8Yb0.2 CaCu2O7 superconductor
Date
2008
Authors
Marsom E.S.
Yahya A.K.
Hamid N.A.
Awang Z.
Hamadneh I.
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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 ?m average grains size for the sample without complexing agents. Addition of the complexing agents induced growth of elongated grains of 5-10 ?m 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.
Description
Keywords
Complexing agents , Microstructure , Single-step , Sol-gel , Superconductor , Tl-1212 , Citric acid , Lead , Microstructure , Sol-gel process , Superconducting materials , Temperature , Ytterbium , Complexing agents , Critical temperatures , Elongated grains , Single-step , Single-step sol-gel , Superconducting oxides , Tl-1212 , Ultra fine grain , Superconductivity