中文摘要：

Zr02掺杂能够在GdBCO超导块材中生成细小的纳米GdzBa4ZrCuOy粒子，从而提高样品的磁通钉扎力．本文采用新的顶部籽晶熔渗生长法（Gd＋011TSIG）制备出了系列组份为（1-x）（Gd203＋1．2BaCuO2）＋xZrO2的单畴GdBCO超导块材，x=0、0．02、0．04、0．05、0．06、0．08、0．1、0．15、0．2、0．3wt．％，并研究了Zr02掺杂量对样品的表面形貌、磁悬浮力、捕获磁通密度以及微观结构的影响．结果表明，样品的表面形貌与ZrOz的掺杂量密切相关，当x％0．1wt．％时样品表面光滑且具有明显的单畴特征；当0．1wt．％≤x〈0．2wt．％时，样品仍具有明显的单畴特征，只是单畴样品的表面出现凸起的规则台阶状的条纹；当z≥0．2wt．％时，虽然样品仍具有明显的单畴特征，但样品的表面不仅出现了台阶状的条纹，而且样品已无法保持其原有的圆柱体形貌，并向柱体外侧突出成四个扇瓣状．样品的磁悬浮力和捕获磁通密度随着x增大呈先增大后减小趋势，当x=0．05wt．％时磁悬浮力最大为36．57N（77K，0．5T），捕获磁通密度最大为0．32T（77K，永磁体充磁）．这些结果对进一步提高GdBCO超导块材的质量具有一定的指导意义．

英文摘要：

Nanoscale Gdz Ba4 ZrCuOy particles can act as an effective flux pinning centers to improve the physical properties of Gdt3CO bulk samples. In this paper, nanoscale Gdz Ba4 ZrCuOy particles have been introduced into single domain Gdt3CO superconductors by the new top-seeding infiltration and growth process（Gd＋011 TS1G） with compositions of （1-x）（Gd2O3＋1.2BaCuO2）＋xZrO2, （x=0,0. 02,0. 04,0. 05,0. 06,0. 08,0. 1,0. 15,0. 2,0. 3 wt. %）. The effect of ZrO2 doping on the growth morphology, the levitation force, the trapped field and microstructure of single domain G-dBCO bulks has been investigated. The results show that the single domain GdBCO bulk samples can be fabricated within the scope of the doping, and the surface morphologies of the samples are closely related to the doping content x. It is of a smooth and flat surface with cross pattern of four equal sectors when x〈0. 1 wt. ~//00, but it becomes of a wrinkle surface when 0. 1 wt. % ≤x〈0. 2 wt. %. The test results show that the levitation force and the trapped magnetic field of samples increases first and then decreases with the increasing of x, the largest levitation force of 36. 57 N （77 K,0. 5 T） and the largest trapped field of 0. 32 T （77 K, magnetized by permanent magnet） are obtained in the sample with x= 0. 05 wt. %. The results provided a very important way to introduce nanoscale Gdz Ba4 ZrCuOy particles to enhance the flux pinning force and physical properties of GdBCO bulk superconductors.