INFLUENCE OF DOPING ON PROPERTIES OF SUPERCONDUCTOR Tl1-x-yPbxMy) Sr-2(Ca(0.8)Ln(0.2))Cu2O7-delta (M = Sn4+ or Sb5+, Ln = Y, La, Nd or Pr)

被引：0

作者：

Zhang Yufen ^{[1
]}

Zhou Dingyuan ^{[1
]}

Zheng Xianmiao ^{[1
]}

Lin Bingxiong ^{[1
]}

Tang Youqi ^{[1
]}

机构：

[1] Peking Univ, Lab Appl Phys Chem, Inst Phys Chem, Beijing, Peoples R China

来源：

ACTA PHYSICO-CHIMICA SINICA | 1990年 / 6卷 / 03期

关键词：

D O I：

10.3866/PKU.WHXB19900302

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Subramanian et al, found superconductivity at 80 K in Tl0.5Pb0.8Sr2CaCu2Oy sample with YBa2 Cu-a O7-4 structure. However, there is unstable factor in the structure of the supereconductor. Total plus valenco is 12.5, and total minus valence is 14. The structure was further stabilized by partial substitution of Y, La, Nd or Pr for Ca and Sn4+ or Sb3+ for (Tl, Pb), so that T-a was achied above 100 K. For example, T-c is about 103 K in a sample with nominai composition (Tl-0.4 Pb-0.5 Sn-0.2) Sr-2 (Ca0.8Y0.2) Cu-2 O7-delta. During the preparation of supereconductors, the temperature of samples was very slowly down after sintering, or samples were annealed at 300-700 degrees C. The samples absorbed the oxygen during cooling, but no phase change occured. Appropriate amount of the oxygen made T-c higher.

引用

页码：259 / 262

页数：4