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Journal of Applied Sciences
  Year: 2008 | Volume: 8 | Issue: 1 | Page No.: 185-188
DOI: 10.3923/jas.2008.185.188
 
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Influence of Tl-Containing Coprecipitation Derived Precursor Powder on Microstructure and Transport Properties of Tl0.8Bi0.2Sr2Ca0.8Y0.2Cu2O7 Superconducting Dip-Coated Tapes

Faizah Md. Salleh, Ahmad K. Yahya, Zaiki Awang and Mohd H. Jumali

Abstract:
Ag clad dip-coated superconductor tapes were fabricated from Tl-1212 superconducting powders of Tl0.8Bi0.2Sr2Ca0.8Y0.2Cu2O7 starting composition derived via two different methods; the conventional Solid-State (SS) and coprecipitation (CP) methods. The effects of using superconducting powders derived from SS and CP methods on phase formation, microstructure and critical current density were investigated for tapes annealed at 850°C for 60 min in flowing O2. XRD analysis of the tapes oxide cores indicated a lower volume percentage of 1212 phase for the CP tape (84%) compared to the SS tape (97%). However, the transport Jc of the CP tape (4670 A cm-2) was significantly higher than the SS tape (560 A cm-2). The SEM micrograph of the CP tape’s oxide core revealed partially melted microstructure with fused grains in contrast to the microstructure of the SS tape’s core which shows porous microstructure with irregularly shaped grains. The higher Jc for the CP tape is suggested to be due to improved inter-grain connectivity as a result of the partial melting.
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How to cite this article:

Faizah Md. Salleh, Ahmad K. Yahya, Zaiki Awang and Mohd H. Jumali, 2008. Influence of Tl-Containing Coprecipitation Derived Precursor Powder on Microstructure and Transport Properties of Tl0.8Bi0.2Sr2Ca0.8Y0.2Cu2O7 Superconducting Dip-Coated Tapes. Journal of Applied Sciences, 8: 185-188.

DOI: 10.3923/jas.2008.185.188

URL: https://scialert.net/abstract/?doi=jas.2008.185.188

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