Iodometric titration for determining the oxygen content of samples doped with Fe and Co

被引：26

作者：

Chen, WM ^{[1
]}

Hong, W ^{[1
]}

Geng, JF ^{[1
]}

Wu, XS ^{[1
]}

Ji, W ^{[1
]}

Li, LY ^{[1
]}

Qui, L ^{[1
]}

Jin, X ^{[1
]}

机构：

[1] NANJING UNIV,NATL LAB SOLID STATE MICROSTRUCT,NANJING 210093,PEOPLES R CHINA

来源：

PHYSICA C | 1996年 / 270卷 / 3-4期

关键词：

D O I：

10.1016/S0921-4534(96)00501-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Double iodometric titration is a method developed for high-T-c superconductivity. It has been widely used to determine the effective oxidation of copper and to figure out the oxygen content in a sample in the past years. If a sample is doped with some metals like iron and cobalt, these metal ions can interfere in experiment results. This is a major defect for iodometric titration. To solve this problem, we introduce ammonium hydrogen fluoride as a complex agent into the method. The agent can prevent the interference of ions of iron and cobalt. For samples LaBa2Cu3-xFexOy and YBa2Cu3-xCoxOy, we determine the oxygen content by an improved double iodometric titration in which the ammonium hydrogen fluoride is used as an interference-free agent. For samples doped with a small amount of Fe or Co, experiment results agree well with those of other researchers. As to samples doped with a large amount of Fe or Co, we determine their values of oxygen content and the results are reasonable.

引用

页码：349 / 353

页数：5

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