中文摘要：

通过顶部热籽晶熔融织构的方法,我们成功地制备出了掺杂新型第二相微粒xGd_2Ba_4CuFeO_y（x=0,0.002,0.004,0.008,0.02）的单畴超导块材GdBCO.通过扫描电镜观察,我们发现,随着掺杂量的增加,一种带状组织存在于掺杂Gd_2Ba_4CuFeO_y微粒的超导块材中;Gd_2BaCuO_5粒子尺寸减小,分布得更加均匀,而Gd_2Ba_4CuFeO_y微粒可能形成有效的钉扎中心;掺杂一定量的包含磁性粒子的Gd_2Ba_4CuFeO_y微粒不但没有破坏超导块材的超导性能,反而增强了超导块材的磁通捕获能力和临界电流密度,超导块材的最大磁通捕获量达到0.16T,临界电流密度TC最大值达到6.4×10^4 A/cm^2,使超导块材的超导性能得到明显改善.实验结果对于研究含磁性粒子的第二相添加提高超导块材的性能有着重要的意义.

英文摘要：

Single-domain superconductor bulk GdBCO with the different ratio of the new second phase particles Gd2 Ba4 CuFeOy （x= 0,0. 002,0. 004,0. 008, 0. 02）, were successfully fabricated by the top hot-seeded melt textured growth method. By scanning electron microscopy observation, we found, with the doping of Gd2 Ba4 CuFeOy particles, a banded structure exists in the bulks and the size of Gd2 BaCuO5 particles decreases with the homogeneous distribution. The doping of GdFe2411 particles with Fe magnetic ion significantly enhances the trapped flux capacity and critical current density, without degradation the bulk superconducting properties. The maximum trapped flux reached 0. 16 T and the maximum value of the critical current density reaches 6.4 × 10^4 A/cm^2. It is very important for the study in further improvement in the properties of GdBCO bulk superconductors with second phase include magnetic ion.