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This study investigated the phase transformation of the REBa2Cu3O7-x (RE=Nd, Gd, Dy) superconductor, and CCT (Continuous-Cooling-Transformation) along with the TTT (Time-Temperature-Transformation) diagrams are suggested according to the isothermal and continuous cooling heat-treatments. The peritectic temperature of the 123 phases decreased approximately 30oC when the ionic radius of the rare-earth elements was reduced. The optimum cooling rate where BC and Cu-free phases do not exist was 0.001oC/s. At this cooling rate, the 123 phase grew with a c-axis perpendicular to the surface and had a well-distributed 211 phase. When the oxygen partial pressure was reduced during isothermal heat-treatment, the formation temperature of the 211 phase decreased. In addition, the formation temperature of the 123 phases decreased from 1000oC (Nd-123) to 925oC (Gd-123), and finally 875oC (Dy-123) according to the decrease in the ionic radius of the rare-earth elements. Compared to Nd-123, Gd- and Dy-123 had a better texture with a well-distributed 211 phase.

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