Phase stability and superconducting characteristics of CaBa(La1-xRx)Cu3O7-δ (R=rare earth) system

✍ Scribed by R.A. Gunasekaran; I.K. Gopalakrishnan; P.V.P.S.S. Sastry; J.V. Yakhmi; R.M. Iyer

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 474 KB
• Volume: 199
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90406-3

✦ Synopsis

It is concluded from detailed investigations on rare-earth-substituted 1113-system CaBaLa1 _xRxCu307_6 (R = Pr, Nd, Sm, Eu, Gd, Er, Ho, Dy, Yb and Tm) that only R=Pr and Nd have a complete range of solid solubility (0~<x~< 1.0). Among other rareearth ions, only Sm (x ~ 0.8 ) and Eu (x ~< 0.6) have a large enough range of solid solubility, while the remaining undergo severe phase separation resulting in the formation of multiphase mixtures even for low values of x. The To-values of Ca-BaLa1 _xRxCu3OT_6 (R = Nd, Sm and Eu) show a decreasing trend with increase in x. In these respects, the influence of substitution of rare-earth ions in the CaBaLaCu3OT_6 system is quite different from that in YBa2Cu3OT_6, except that both CaBaPr-Cu307_~ and PrBa2Cu307_6 are semiconducting.