Luminescence of oxide films during the electrolytic oxidation of tantalum

被引：16
作者：
Stojadinovic, S. [1 ]
Tadic, N. [1 ]
Vasilic, R. [1 ]
机构：
[1] Univ Belgrade, Fac Phys, Belgrade 11000, Serbia
来源：
ELECTROCHIMICA ACTA | 2015年 / 152卷
关键词：
tantalum; electrolytic oxidation; galvanoluminescence; spark discharges; BARRIER ANODIC FILMS; TA2O5; THIN-FILMS; ELECTRICAL BREAKDOWN; PLASMA; PENTOXIDE; ALUMINUM; GROWTH; ANODIZATION; TITANIUM; GALVANOLUMINESCENCE;
D O I：
10.1016/j.electacta.2014.11.158
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Luminescence during a constant current electrolytic oxidation of tantalum in phosphoric acid and oxalic acid is investigated. Weak anodic luminescence (galvanoluminescence) of barrier oxide films during the electrolytic oxidation is correlated to the existence of surface imperfections. Galvanoluminescence is more intense for rougher tantalum samples, higher current density, and higher electrolyte temperature. Spectral characterization of galvanoluminescence showed that there are wide luminescence bands mostly in the visible and near infrared spectral region. Small sized sparks generated by dielectric breakdown cause rapidly increasing luminescence intensity. The luminescence spectrum under spark discharging has several intensive peaks caused by electronic transitions in oxygen and hydrogen atoms. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：323 / 329
页数：7
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