Growth of Grain Oriented Ingot of High T sub c Superconducting Oxides by Zone Refining

摘要

The objective of Phase I was to enlarge microscopic crystallites to a size such that they could be cut out of ceramic material and used as an interconnection in a circuit device. The procedure used to increase the size of single crystal form of high T(c) material attempted to take advantage of initial formation of crystallites at 950 C. Solid phase epitaxial growth of larger crystallites was performed by developing a temperature gradient in a tube furnace. A very narrow zone was moved slowly along the length of the material to permit solid phase epitaxial formation of larger crystallites. Larger crystallites were not obtained; multiphases of the ceramic materials formed instead of single crystallites of large size.