The effects of Ag, Mg, and Pr doping on the superconductivity and structure of BSCCO

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• 作者：N. Boussouf ; M.-F. Mosbah ; T. Guerfi ; F. Bouaï ; cha ; S. Chamekh ; A. Amira
• 关键词：Bi(Pb)2212 doped
• 刊名：Physics Procedia
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：2
• 期：3
• 页码：1153-1157
• 全文大小：398 K

文摘

The influence of Ag, Mg, and Pr additions and co-additions on microstructure and phase formation of Bi₂Sr₂CaCu₂O_8+d (Bi2212) system is investigated. Polycrystalline Bi2212 samples were synthesized in air by solid state reaction method. Phase analysis, micro structural observations and magnetic properties were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and A.C. susceptibility measurements respectively. XRD results reveal two main phases (Bi-2201 and Bi2212). SEM photographs show that the substitution by Ag, Mg or Pr affects the mechanism of the grains growth. The undoped sample has a critical temperature T_c of 65 K while in the Mg and Ag containing compounds the T_c is 77 K and 75 K respectively. The Pr containing compound exhibits no superconductivity. A valence of the Pr ion higher than 3⁺ in the lattice supports the holefilling mechanism of the suppression of superconductivity.