| 摘要 |
There is disclosed a composition described by the formula: (R Ba2Cu3O7- delta )X + (PrBa2Cu3O7- delta )1-X wherein: R comprises Y, Ce, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and/or Lu; 0 < x </= 1; and delta is such that the R Ba2Cu3O7- delta component of the composition is in a metallic phase.
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