Electrochemical oxidation of Y-Ba-Cu-O high-Tc superconductors

被引：0
|
作者：
Chudnovskii, FA
Malinenko, VP
Pergament, AL
Stefanovich, GB [1 ]
机构：
[1] Petrozavodsk State Univ, Petrozavodsk 185640, Russia
[2] Inst Physicotech, St Petersburg 194021, Russia
来源：
ELECTROCHIMICA ACTA | 1998年 / 43卷 / 12-13期
关键词：
high-T-c superconductor; YBa2Cu3O7-delta; oxygen deficiency; anodic oxidation; KNO3-NaNO3; melt;
D O I：
10.1016/S0013-4686(97)00315-0
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The electrochemical oxidation of YBa2CU3O7-delta high-T-c, superconductor (both films and ceramics) in a KNO3-NaNO3 melt has been studied. Anodic polarization of nonsuperconducting oxygen-deficient films of about 2000 Angstrom thick at T = 360 degrees C, i = 50 mA cm(-2) for t approximate to 40 s leads to the appearance of superconductivity of the sample with T-c = 89 K. The estimation of temperature dependence of the oxidation efficiency is made and the optimum oxidation temperature it; found to be 350 degrees C. The efficiency of oxidation falls and anodic dissolution of the sample begins as the temperature decreases. For electrochemical oxidation in the melt at T greater than or equal to 350 degrees C, the oxidation efficiency is equal to similar to 1% for YBa2CU3O7-delta films and almost 100% for ceramics; This fact indicates an important role of the sample morphology and grain-boundary ionic transport in the process of electrochemical oxidation. (C) 1998 Elsevier Science Ltd. All rights reserved.
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收藏
页码：1779 / 1784
页数：6
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