The Effect of Barium Doping on the Selective Structure of Bi-2223 Phase

作者：Salamati Hadi; Kameli Parviz; Morshedloo Toktam; Abdolhosseini Ismaeil^*; Ahmadvand Hossein; Baghi Marzieh; Koohani Hossein; Beirami Hadi

来源：Journal of Superconductivity and Novel Magnetism, 2011, 24(4): 1267-1272.

DOI：10.1007/s10948-010-0821-x

• Bi-biased superconductors
• Barium substitution
• 2223 phase formation
• Critical current density

The partial substitution of Sr by Ba in the two nominal compositions of Bi1.8Pb0.4Sr2-x Ba (x) Ca2.2Cu3O (y) [x=0.0, 0.1, 0.2, and 0.3 (A group)] and Bi1.66Pb0.34Sr2-x Ba (x) Ca2Cu3O (y) [x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5 (B group)] have been investigated by resistivity, ac susceptibility measurements and by XRD and SEM analysis. In general, the nature of the temperature dependence of resistivity and susceptibility measurements indicate the presence of a superconducting transition between grains coupled by weak links. However, the XRD and SEM analyses show that the relative composition of initial elements used in Bi-(2223) is essential to the site that is selected by the Ba ions. In the A group, Ba doping up to x=0.1 will improve the phase formation of Bi-2223, and improve the superconductivity properties of the samples. In the B group, although Ba doping up to x=0.1 will enhance the phase formation of Bi-2223, it will decrease the coupling between the grain and the superconductivity properties of these systems. The presence of lower Tc phases will begin to appear for x > 0.1, in both of these systems. The superconductivity properties and the phase formation of Bi-(2223) will decrease as the Ba concentration increases.

• 出版日期2011-5