Effects of the growth velocity on the crystal growth behavior ofBi_2Sr_2Ca_1Cu_2O_x (Bi-2212) have been studied by floating zone technique. Theresults show that a necessary condition for obtaining large single crystalsalong the c-axis is that the solid-liquid interface of a growing rod maintainsa stable planar growth front. The planar liquid-solid growth interface tends tobreak down into a cellular interface, while the growth velocity is higher than0.25 mm/h. Single crystals of up to 50x7.2x7 mm3 along the a-, b- and caxeshave been cut in a 7.2 mm diameter rod with optimum growth conditions. Tconsetis 91 K measured by magnetic properties measurement system (MPMS) for as-growncrystals. Optical polarization microscope and neutron diffraction show that thequality of the single crystals is good.
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机译：通过浮区技术研究了生长速度对Bi_2Sr_2Ca_1Cu_2O_x（Bi-2212）晶体生长行为的影响。结果表明，沿c轴获得大单晶的必要条件是生长棒的固液界面保持稳定的平面生长前沿。平面的液-固生长界面倾向于分解成细胞界面，而生长速度高于0.25 mm / h。在具有最佳生长条件的直径7.2 mm的棒中，沿a，b和caxeshave切割高达50x7.2x7 mm3的单晶。 Tconsetis 91 K由磁特性测量系统（MPMS）测量，用于生长的晶体。光学偏振显微镜和中子衍射表明单晶质量良好。
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