CALCULATION OF SUBSOLIDUS PHASE RELATION DIAGRAMS OF Y-Ba-Cu-O SYSTEM

摘要

Mathematical principle and Qiethod for the calculation of subsolidus phase relation diagrams of the quasi-temary system YO_(13)-BaO-CuO were developed,and the corresponding mathematical model was es-Ublished.Subsolidus phase relation diagrams of this system at different temperatures were calculated from thermodynamic dala.The calculated results showed that in Y-Ba-Cu-O system BaCuO_(2) and Y_(3)BaCuO_(5) are thermodynamically stable at room-temperature,and Y_(2)Cu_(2)O_(5) and YBa_(2)Cu_(3)O_(65 )also become stable at tem peratures higher than 300°C and 750°C respectively.The calculated results are in good agreement with those from experiments.