Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
Session ID : 8
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Superconducting Properties and Phase Stability of REBa2Cu3O7-x (RE=Nd, Gd, Dy) Superconductors during Continuous Cooling and Isothermal Heat Treatment
Yong Taeg OYong Hee HANNyeon Ho JEONGDong Chan SHIN
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Abstract
The phase transformation of REBa2Cu3O7-x (RE=Nd, Gd, Dy) was investigated using isothermal heat-treatment and continuous cooling in air. During continuous cooling, the REBa2Cu3O7-x (RE-123) superconducting phase with well-distributed RE2Ba1Cu1O5 (RE-211) was obtained at the cooling rate of 0.001°C/s. Single phase of RE-123 (Nd, Gd, Dy) was stable at 1050°C, 1000°C, and 950°C during isothermal heat-treatment, respectively. Above these temperatures RE-211 phase existed within the RE-123 grains. The RE-123, RE-211, BaCu2O2, and CuO phases coexisted at 50°C below the partial melting temperature for each respective RE-123. The variations in the phase transformation and microstructure change on rare-earth elements were explained by the different ionic radii of the elements. The superconducting properties of each specimen heat-treated under the optimum conditions were compared with the magnetic characteristics.
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© 2004 The Ceramic Society of Japan
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