ON THE NEW PHASE (BI, PB)3SR2CA2CUOY IN THE BI-PB-SR-CA-CU-O SYSTEM

被引：56

作者：

DOU, SX ^{[1
]}

LIU, HK ^{[1
]}

ZHANG, YL ^{[1
]}

BIAN, WM ^{[1
]}

机构：

[1] NE UNIV TECHNOL,CTR MEASUREMENT,SHENYANG,PEOPLES R CHINA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1991年 / 4卷 / 05期

关键词：

D O I：

10.1088/0953-2048/4/5/005

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new Pb-rich compound (Bi, Pb)3Sr2Ca2CuOy (3221) has been identified and synthesized. Electron diffraction and x-ray diffraction data revealed that the 3221 phase has unit cell parameters of a = 0.9919 nm and c = 0.3471 nm with a hexagonal symmetry, which is in contrast to the commonly found tetragonal or orthorhombic symmetry in the Bi-Pb-Sr-Ca-Cu-O systems. The ordered superlattice structure consisting of three unit cells was observed along the [h0h0BAR] direction. The 3221 compound shows no superconducting transition to liquid helium temperature. By using a combination of the volumetric measurement technique and iodometric titration it was found that 100% Pb were tetravalent while 10% Cu were trivalent when the samples were treated in air. For the sample treated in nitrogen no Cu3- were detected, while Pb remained in the tetravalent state.

引用

页码：203 / 206

页数：4

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