Crystal growth of the high-TC superconductor in the Bi-Sr-Ca-Cu-O system.

概要

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Small disc-like grains of the low-Tc (80 K) phase in Bi-based superconductors grow to larger, plate-like crystals of the high-Tc (110 K) phase during heating at the temperature higher than 870°C. In the SEM images of polished sections some phases other than the superconductive ones are observed always in the process of the crystal growth. According to the EPMA measurement they are identified as following three; Ca2CuO3, in which about 8% of Ca are substituted by Sr, (Sr1–z, Caz)3Cu5Ox (Z≅0.4), in which less than 2% of Bi is involved, and CuO. They show different colour under optical microscope. Based on the sequential change in their fraction it may be considered that Ca2CuO3 and/or (Sr1–z, Caz)3Cu5Ox react with the matrix low-Tc phase to produce the high-Tc one.
The Iron and Steel Institute of Japanの論文