کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1664426 | 1518011 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical and semiconducting properties of thin passive film formed on titanium in chloride medium at various pH conditions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrochemical and semiconducting properties of thin passive film formed on titanium in chloride medium at various pH conditions Electrochemical and semiconducting properties of thin passive film formed on titanium in chloride medium at various pH conditions](/preview/png/1664426.png)
چکیده انگلیسی
The electrochemical behavior of titanium has been investigated in chloride electrolyte of different pH values (2.1, 5.2 and 7.4). Potentiodynamic polarization studies showed wide passive behavior irrespective of change in pH. Passive films were grown by applying different passive potentials (0.2 to 0.6 V (vs SCE)) by recording chronoamperometric curves for duration of 8 h. Electrochemical impedance spectroscopy (EIS) measurements showed higher impedance values for the oxide layer grown in neutral pH condition and for oxides formed at higher formation potentials. Emphasis is made mainly on the properties of titanium oxide estimated by Mott-Schottky analysis, which shows that passive film formed, is of n-type semiconducting film and the donor concentration is in the order of 1020 cmâ 3. The calculated diffusivity of point defects is in the range of (0.5 to 2.5) à 10Ë16 cm2sâ 1 and tends to decrease with increase in electrolyte pH. Surface morphology of the passive films was examined using scanning electron microscope and surface roughness was characterized using confocal microscope. Ex- situ ellipsometry measurements were performed to analyze the optical constants of the oxide layer and to determine the oxide thickness. The thickness is in the range of 3.5 to 5.8 nm and comparable to the calculated values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 598, 1 January 2016, Pages 260-270
Journal: Thin Solid Films - Volume 598, 1 January 2016, Pages 260-270
نویسندگان
Balakrishnan Munirathinam, R. Narayanan, Lakshman Neelakantan,