A COMPARISON OF THE STABILITY OF BI2SR2CACU2O8+Y WITH YBA2CU3O6.5+Y IN VARIOUS SOLUTIONS

被引：34

作者：

LIU, HK

DOU, SX

BOURDILLON, AJ

SORRELL, CC

机构：

[1] Univ of New South Wales

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1988年 / 1卷 / 04期

关键词：

Bismuth Compounds - Ceramic Materials - Corrosion - Electrochemical - Yttrium Compounds;

D O I：

10.1088/0953-2048/1/4/008

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The chemical behaviour of both YBa2Cu3O6.5+y {123} and Bi2Sr2CaCu2O8+y {2212} in various solvents was studied in a comparative manner. In both compounds superconductivity apparently depends on a high-oxidation state of Cu. Electrochemical corrosion rates were measured by a variety of techniques and are related to the concentration of labile Cu3+ ions in the specimens. Generally {2212} is the more stable compound, except in strongly basic solutions owing to the amphoteric nature of Bi. In the presence of acidic or basic solutions Bi3+ is oxidised to Bi4+ or Bi5+ by the high-oxidation state of Cu in {2212} (similar to oxidation by Na2O2), demonstrating a common feature of cuprate superconductors. The concentration of labile ions was determined by the volumetric measurement of evolved oxygen from acid solution, and the technique was extended to measure the concentration of undecomposed or re-formed carbonates after sintering.

引用

页码：194 / 197

页数：4

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