Solid State Science and Technology, Vol. 17, No 1 (2009) 148-154

 ISSN 0128-7389

 

SYNTHESIS OF Tl0.85Cr0.15Sr2CaCu2O7-δ SUPERCONDUCTOR FROM COPRECIPITATION Tl-FREE PRECURSOR

N. Ibrahim, M. I. Mohd Yusof and F. Md. Salleh

Faculty of Applied Sciences, Universiti Teknologi MARA,

40450 Shah Alam, Selangor, Malaysia

 

ABSTRACT

In this study, high purity Tl1212 superconductor samples were successfully synthesized from Tl0.85Cr0.15Sr2CaCu2O7-δ nominal starting composition by a two-step solid-state reaction method using Tl-free precursor powder prepared from coprecipitation method. The effect of using two different excess amount of precipitating agent (case I and case II) to react with metal oxalates in precursor preparation by coprecipitation method was investigated. XRD pattern of all samples sintered at 1000 oC for 4 minutes essentially showed formation of high purity 1212 phase. The results of samples’ zero resistance critical temperature, Tc zero were between 98-99 K and bulk critical current density, Jc measured at 40 K in zero magnetic fields were around 5-9 A/cm2. SEM investigation on the sample derived from case I and II revealed distinctly different sample morphology. The synthesized high purity sample can be useful as starting material for high temperature superconductor tapes fabrication.

 

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