Ba和Mg掺杂对Bi（Pb）－Sr－Ca－Cu－O超导性能的影响

Effect of Ba and Mg doping on the Superconductivity of the Bi(Pb)-Sr-Ca-Cu-O System

采用固态反应法制备了名义组分为Ｂｉ１．８Ｐｂ０．２Ｓｒ２Ｃａ２Ｃｕ３Ｏｘ和Ｂｉ０．９Ｐｂ０．１Ｂａ０．１Ｍｇ０．１Ｓｒ０．８ＣａＣｕ２Ｏｘ超导样品，并研究了Ｂａ、Ｍｇ掺杂对Ｂｉ系超导性能的影响。用ｘ射线衍射及电阻－温度关系的测量获得的实验结果表明，添加Ｂａ和Ｍｇ元素可以有效地抑制Ｂｉ系２２１２相的生成，促进２２２３相的形成，并能提高超导材料的Ｔｃ．

Two samples of the nominal compotsition of Bi1.8Pb0.2Sr2Ca2Cu3Ox and Bi0.9Pb0.1-Ba0.1Mg0.1Sr0.8CaCu2Ox are prepared by the solid-state reaction. The effect of Ba and Mg dopingon the superconductivity is studies,X-ray powder diffraction and the temperature dependence of theresistivity are measured. The results indicate that the formation of the 2212 phase is effectivelyrestrained while the 2223 phase is remarkably enhanced and the Tc are increased by the addition of the Ba and Mg elements.