Solid State Science and Technology, Vol. 11, No 1 (2003) 139-146




Imad Hamadneha, S.A. Halim*a, C.K. Leeb, W. M. Daud and Z.A. Hassana aDepartment of Physics, bDepartment of chemistry

Faculty of Sciences and Environmental Studies

43400 Universiti Putra Malaysia

Serdang, Selangor, Malaysia




The influence of Sm doping on the phase formation, normal state properties and microstructure development of Bi-2223 superconductors was systematically investigated. Samarium was incorporated in the strontium site with x ranging from 0.00 to 0.30 prepared via coprecipitation technique. The four point probe measurements showed the loss in metallic behaviour for the samples with Sm doped above x=0.2. XRD results showed the decrease of the volume percentage of the 2223 phase followed by increasing in the density of the lattice. The SEM micrographs showed the decrease in the grain size for all samples containing samarium. The temperature dependence of ac susceptibility data shows the shifting towards lower temperature as the Sm concentration increases presence of low Tconset  phase. The imaginary component, χ”, shows a decrease in the intergranular coupling peak, Tp, towards lower temperature as the Sm concentration increases. Samarium did not enhance the Tc(R=0) but gradually decreases its value from 102. K to 52 K for x=0.00 to x=0.20 respectively.


Key words: High Temperature Superconductors; Oxalic precursor; Coprecipitation.



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