利用BaZrO₃涂层Al₂O₃坩锅生长YBa₂Cu₃O_7-δ单晶体

利用BaZrO 3 涂层Al 2 O 3 坩锅生长YBa 2 Cu 3 O 7-δ 单晶体 Growth of YBa 2 Cu 3 O 7-δ Crystals By Alumina Crucibles Coated Protective Layer of BaZrO 3 寇庆红 KOU Qing hong 1 first-author 刘海林 LIU Hai lin 1 汤五丰 TANG Wu feng 1 余祖兴 YU Zu xing 1 熊锐 XIONG Rui 1 石兢 SHI Jing 1 武汉大学物理科学与技术学院,湖北,武汉,430072 武汉大学物理科学与技术学院,湖北,武汉,430072 School of Physics and Technology, Wuhan University School of Physics and Technology, Wuhan University 在常规 Al2 O3刚玉坩锅内表面制备 Ba Zr O3保护层的方法生长 YBa2 Cu3O7-δ高温超导单晶 .实验结果显示 ,在晶体生长过程中 ,这种 Ba Zr O3薄层确实可以有效地阻止坩锅材料中的 Al向 Y2 O3- Ba O- Cu O溶液的扩散 ,且生长出的 YBa2 Cu3O7-δ晶体中 ,在仪器精度范围内没有发现 Al杂质的存在 .刚刚生长没有进行氧退火处理样品具有四方对称性 ,晶格常数分别为 a=0 .385 86 nm,b=0 .385 83nm ,c=1.17931nm ,α=β=γ=90°.简单氧气氛下热处理后 ,超导转变温度由 45 K提高到 84K. We develop a novel technique of the solution for the crucible corrosion problem during the single crystal growth of high T c superconducting YBa 2Cu 3O 7-δ , i.e. coating a layer of BaZrO 3 on Al 2O 3 crucibles to handle the diffusion of Al to melt of Y 2O 3 BaO CuO. The coating material is a polymer compound containing BaZrO 3. The experimental results show that the contamination from Al 2O 3 crucibles can be greatly reduced by this kind of coating BaZrO 3 layer. The effectiveness of the BaZrO 3 layer is found to depend on the sintering conductions. For the crystals grown in the Al 2O 3 Crucibles with a coated BaZrO 3 layer prepared at a high sintering temperature （1 400 1 500 °C） and a long sintering time （48 h）, the composition YBa 2Cu 3O 7-δ is confirmed and the aluminum contamination is not detectable. The as grown crystals show tetragonal symmetry with the lattice constants: a =0.385 86 nm, b =0.385 83 nm, c = 1.179 31 nm; and α=β=γ =90°. After oxygen annealing, the superconducting transition temperature T c of the crystal increases from 47 K to 84 K. BaZrO3涂层 Al2O3坩锅 YBa2Cu3O7-δ单晶 BaZrO 3 layer Al 2O 3 crucible YBa 2Cu 3O 7-δ crystals O511.3 教育部跨世纪人才基金资助项目 （教技 2 0 0 13 :超导磁通晶格相变研究 ） 2001-03-01 2021-04-01 3