论文部分内容阅读
比较了固态混合法和硝酸盐共分解法制备原料粉末的优劣,结果表明,用硝酸盐共分解法制备的粉末,经压块烧结后的J_c是固态混合法的5倍,X射线衍射结果表明,前者的110K相含量明显大于后者。本文还比较了一次和二次压制烧结工艺对超导体性能的影响,结果表明二次压制烧结工艺得到的超导体密度是一次压制烧结工艺的1.5—2倍,前者的J_c是后者的5倍,二次压制后表面织构明显增加。但高低温超导相的比例改善不明显。采用多重压制烧结法制备名义成份为Bi_(1.84)-Pb_(0.4)Sr_(1.91)Ca_(2.03)Cu_(3.06)O_x。的超导体,其T_c107K,密度5.5g/cm~3,77K磁化电流大于10~4A/cm~2,屏蔽效应超导体积大于90%。Meissner效应超导体积大于70%,磁化率随温度的变化没有两个台阶,粉末X射线衍射完全单相,块材X射线衍射表面有强烈((?))织构。
The results show that the powder prepared by the nitrate co-decomposition method is 5 times higher than the solid state mixing method after the compacting sintering, and the result of X-ray diffraction Show that the former 110K phase content was significantly greater than the latter. The results show that the density of the superconductor obtained by the secondary compression sintering process is 1.5-2 times of that of the primary sintering process, the former J_c is 5 times of that of the latter, Sub-pressed surface texture significantly increased. However, the ratio of high and low temperature superconducting phase is not obvious improvement. The bulk composition of Bi_ (1.84) -Pb_ (0.4) Sr_ (1.91) Ca_ (2.03) Cu_ (3.06) O_x was prepared by multiple compaction sintering. Of the superconductor, the T_c107K, a density of 5.5g / cm ~ 3, 77K magnetization current greater than 10 ~ 4A / cm ~ 2, the shielding effect superconducting volume greater than 90%. Meissner effect superconducting volume greater than 70%, magnetic susceptibility changes with temperature without two steps, the powder X-ray diffraction is completely single-phase, X-ray diffraction block surface has a strong ((?)) Texture.