【摘要】 研究了不同含量纳米银掺杂的（Ｂｉ，Ｐｂ）２Ｓｒ２Ｃａ２Ｃｕ３Ｏｘ 块材．ＤＴＡ 分析表明纳米银掺杂使材料熔点降低，加速了高Ｔｃ 相的形成．磁场下ＲＴ展宽测试表明，纳米银掺杂大大提高了磁通蠕动激活能，其中最佳掺杂１５ｗｔ％ Ａｇ 时激活能提高５ ～６ 倍；掺杂样品的钉扎能Ｕ（ Ｈ） 随磁场降低比非掺杂样品要慢，改善了磁场下的传输性能．交流磁化率测量表明纳米银掺杂使晶间损耗峰向高温移动２０Ｋ，说明纳米银掺杂改善了晶界弱连接，并大大增强了晶界的涡旋钉扎能力．更多还原

【Abstract】 The effect of noanometer Ag particles doping on (Bi,Pb)\-2Sr\-2Ca\-2Cu\-3O\- x bulk is discussed. DTA measurement shows that nm Ag doping can not only lower the melting point of the samples but also accelerate the formation of high T\-c phase. The temperature dependence of resistance at different field amplitudes and the resistance transition broadening indicate that nm Ag doping enhances the activation energy of flux creep by more than 5 times. The decreasing of flux pinning energy U(H) vs magnetic field for doped samples is slower that of undoped, which marks the improvement of transport performance in applied field. AC susceptibility measurement shows the dissipation peak for doped samples shift to 20K higher than that of undoped. As a whole, nm Ag doping reduce the weak links of intergrains and improve the flux pinning notably.更多还原