SYNTHESIS AND STRUCTURAL-ANALYSIS OF THE SUPERCONDUCTING LEAD CUPRATES, (PB, CU) (SR, R)2(R', CE)2CU2OZ (R, R' - RARE-EARTH ELEMENT)

被引：21

作者：

MAEDA, T

SAKUYAMA, K

SAKAI, N

YAMAUCHI, H

TANAKA, S

机构：

[1] Superconductivity Research Laboratory, International Superconductivity Technology Center 10-13, Koto-ku, Tokyo, 135

来源：

PHYSICA C | 1991年 / 177卷 / 4-6期

关键词：

D O I：

10.1016/0921-4534(91)90488-K

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structural analysis of a superconducting (Pb/Cu)-1222 phase. (Pb0.5Cu0.5)(Sr0.875Eu0.125)2(Eu0.75Ce0.25)2Cu2Oz (z almost-equal-to 9). is performed by Rietveld analysis using X-ray powder diffraction data. Pb, Cu and O atoms constituting the (Pb/Cu)O monolayer in this crystal are found to be displaced from their ideal crystallographic sites as previously reported for the (Pb/Cu)-1212 compound. In addition, (Pb, Cu)-1222 compounds with nominal compositions of (Pb, Cu)(Sr, R)2(R', Ce)2Cu2Oz (R, R': rare-earth element) are synthesized and characterized. Nearly single-phase samples are successfully obtained for the compounds with R = R' = Pr, Sm, Eu, Gd, Dy, Y or Ho, and for those with a pair of rare-earth elements, (R, R') = (La, Eu), (Nd, Eu), (Nd, Dy), (Nd, Y), (Nd, Er), (Sm, Eu) or (Eu, Gd). Superconductivity is observed for the samples with R = R' = Sm, Eu or Gd and also for those with (R, R') = (La, Eu), (Nd, Eu), (Sm, Eu) or (Eu, Gd).

引用

页码：337 / 344

页数：8

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