Abstract: The Bi2Sr2CaCu2O8+δ(Bi-2212) superconducting powders were synthesized by Pechini method. The samples were prepared with metal nitrates as starting materials, ethylene diamine tetracetic acid (EDTA) as chelating agent and ethylene glycol as cross-linking agent. The effect of EDTA amount, ethylene glycol amount, oil bath temperature and time during gel processes on the crystallnity and superconductivity of Bi-2212 powders were investigated. The X-ray diffraction (XRD) was employed to investigate the phase purity and crystallnity. The resistance measurements were carried out with a conventional four-probe method. The results showed that phase purity is slightly affected by different gel processes. But the crystallnity and electrical conductivity of Bi-2212 phase changes obviously as shown by the XRD patterns and R-T curves. The difference of its critical transition temperature Tc,0 is 7.3 K.

Key words: 　Bi-2212 , Pechini method , Different gel processes , Crystallinity , Electrical conductivity

摘要： 　    以硝酸盐为原料，乙二胺四乙酸（ＥＤＴＡ）为络合剂，乙烯乙二醇为交联剂，利用Ｐｅｃｈｉｎｉ法制备了名义组分为Ｂｉ_２Ｓｒ_２ＣａＣｕ_２Ｏ_８＋δ（Ｂｉ－２２１２）超导粉体。通过Ｘ射线衍射（ＸＲＤ）、标准四引线法等手段，研究了络合剂、交联剂用量及油浴温度、时间对超导粉体物相、结晶性及电学性能的影响。实验结果表明：不同凝胶化条件制备的超导粉体，均保持较高的相纯度；但工艺参数的改变对Ｂｉ－２２１２粉体的结晶性与电学性能影响显著，其临界转变温度Ｔ_ｃ，０相差７．３Ｋ。

关键词: 　Ｂｉ－２２１２ , 　Ｐｅｃｈｉｎｉ法 , 　不同凝胶化过程 , 　结晶性 , 　电学性能