Superconducting properties of bulk Bi1.6Pb0.4Sr2Ca2− xCdxCu3O10 system prepared via conventional solid state and coprecipitation methods

✍ Scribed by I. Hamadneh; A. Agil; A.K. Yahya; S.A. Halim

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 658 KB
• Volume: 463-465
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.445

✦ Synopsis

The effect of Cd doping on the superconducting properties of BSCCO system with nominal starting compositions of Bi 1.6 Pb 0.4 Sr 2 -Ca 2Àx Cd x Cu 3 O 10 (x = 0.00-0.10) was studied. The preparation methods used to prepare the samples are the conventional solid-state oxide powder (SSR) and the coprecipitation (COP) techniques. Resistivity versus temperature measurements (R-T) showed that all doped samples exhibited metallic behaviour. For the SSR samples, existence of a two step feature was observed at x = 0.07 indicating the presence a lower temperature 2212 phase together with the higher temperature 2223 phase. This behaviour resulted in the shifting of the T C(R=0) towards lower temperature. However, the COP samples showed better superconducting properties probably due to higher homogeneity resulted from mixing of sub-micron particles during sintering. The R-T curve did not display any two step features due to the single phase nature of the samples. This is confirmed by the XRD data where Bi-2212 phase was minor. In addition, small amount of doping (x = 0.02 in COP and SSR samples) enhanced the phase formation and T C(R=0) .