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Characteristics of Y1Ba2Cu3O7-x Hight-Tc Superconductor Prepared by Partial Melting Process
Korean Journal of Chemical Engineering, May 1998, 15(3), 304-309(6), 10.1007/BF02707085
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Abstract
The superconducting Y1Ba2Cu3O7-x, (123) and the Y2Ba1Cu1O5, (211) powders in this study were prepared by pyrophoric synthesis method with Y2O3 (99.9%), BaCO3 (99.9%), and CuO (99.9%) powders. Samples of 123 and 211 pellets were first prepared and then piled to have a 123/211/123 arrangement before a partial melting process was applied for phase change of the center piece (211) to 123 phase through a peritectic reaction. The process parameters were a melting temperature of 1,040-1,070℃ and the mass of the 123 piece ranging from 0.4 to 1.2 g. The superconductivity, such as critical temperature (Tc), and mass susceptibility (χ) of bulk 123 and 211 samples were measured by AC four point probe method and AC susceptometer, respectively. The experimental results can be summarized as follows : the best preparation condition in the range examined was a melting temperature of 1,060℃ and mass ratio [123(A)/211(B)] of 2:1 with melting time of 30 minutes to yield the Tc of 88.5K.
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