Oxygen Measurement in Cuprate Superconductors Using the Dissolved Oxygen/Chlorine Method

Yuliang Wei, Chengcheng Yan, Shiro Kambe
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Abstract

We have developed a dissolved oxygen (DO) method with differential equation (DE) correction. We measured the oxygen content in La-based and Y-based superconductors, and succeeded in measuring the oxygen content simply in one-third of the time required by the iodometric titration method. However, there was a problem with Bi-based superconductors where the measured oxygen content was smaller compared to the iodometric titration method. We hypothesized that not only O2 but also Cl2 gas is generated when dissolving Bi-based superconductors and developed a dissolved oxygen/chlorine (DO/Cl) method with DE correction. This method uses only a dissolved oxygen sensor and a dissolved chlorine sensor to measure the dissolved oxygen and dissolved chlorine content in Bi2Sr2−xLaxCuOy, allowing for the calculation of copper valence and oxygen content. The results from the DO/Cl method with DE correction show that the measured copper valence and oxygen content differ very little from those obtained using the iodometric titration method, with discrepancies within 0.016 and 0.008, respectively. Additionally, this method reduces the measurement time by one-third compared to the iodometric titration method. The results demonstrate that the DO/Cl method with DE correction can effectively measure the copper valence and oxygen content in cuprate superconductors, and using hydrochloric acid as the experimental solution is superior to sulfuric acid and nitric acid.
使用溶解氧/氯法测量铜氧化物超导体中的氧含量
我们开发了一种带有微分方程校正的溶解氧 (DO) 方法。我们测量了 La 基和 Y 基超导体中的氧含量,并成功地在碘滴定法所需的三分之一时间内测量出了氧含量。然而,在 Bi 基超导体中存在一个问题,与碘滴定法相比,测量的氧含量较小。我们推测,在溶解 Bi 基超导体时,不仅会产生 O2,还会产生 Cl2 气体,因此开发了一种带有 DE 校正功能的溶解氧/氯(DO/Cl)方法。该方法仅使用一个溶解氧传感器和一个溶解氯传感器来测量 Bi2Sr2-xLaxCuOy 中的溶解氧和溶解氯含量,从而计算出铜价和氧含量。采用溶解氧/溶解氯法进行 DE 校正的结果表明,测得的铜价和氧含量与采用碘量滴定法测得的铜价和氧含量相差很小,分别为 0.016 和 0.008。此外,与碘量滴定法相比,这种方法还能将测量时间缩短三分之一。结果表明,带 DE 校正的 DO/Cl 方法能有效测量铜氧化物超导体中的铜价和氧含量,而使用盐酸作为实验溶液则优于硫酸和硝酸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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