scholarly journals Semiconducting properties of oxide films formed onto an Nb electrode in NaOH solutions

2008 ◽  
Vol 73 (3) ◽  
pp. 351-367 ◽  
Author(s):  
Vladimir Jovic ◽  
Borka Jovic
Keyword(s):  
Space Charge ◽  
Oxide Films ◽  
Passive Films ◽  
Flat Band ◽  
Potential Range ◽  
Donor Density ◽  
Nano Crystalline ◽  
Semiconducting Properties ◽  
Eis Measurements ◽  
Charge Capacitance

In this paper, the results of the potentiostatic formation of homogeneous and heterogeneous, nano-crystalline passive films of Nb2O5 onto an Nb electrode in NaOH solutions of different concentrations at potentials lower than 3.0 V vs. SCE are presented. The semiconducting properties of such films were investigated by EIS measurements. After fitting the EIS results by appropriate equivalent circuits, the space charge capacitance (Csc) and space charge resistance (Rsc) of these films were determined. The donor density (Nsc), flat band potential (Efb) and thickness of the space charge layer (dsc) for such oxide films were determined from the corresponding Mott-Schottky (M-S) plots. It is shown that all oxide films were n-type semiconductors in a certain potential range.

scholarly journals Analysis of the Space Charge Capacitance of Bipolar Semiconductor Passive Films (II)

2009 ◽  
Vol 25 (06) ◽  
pp. 1213-1218 ◽  
Author(s):  
CHEN Chang-Feng ◽  
◽  
JIANG Rui-Jing ◽  
QIAN Jin-Sen ◽  
ZHENG Shu-Qi
Keyword(s):  
Space Charge ◽  
Passive Films ◽  
Charge Capacitance ◽  
Bipolar Semiconductor

Space charge capacitance spectroscopy in amorphous silicon Schottky diodes: Theory, modeling, and experiments

2012 ◽  
Vol 358 (17) ◽  
pp. 2007-2010 ◽  
Author(s):  
O.A. Maslova ◽  
M.E. Gueunier-Farret ◽  
J. Alvarez ◽  
A.S. Gudovskikh ◽  
E.I. Terukov ◽  
...  
Keyword(s):  
Space Charge ◽  
Amorphous Silicon ◽  
Schottky Diodes ◽  
Modeling And Experiments ◽  
Capacitance Spectroscopy ◽  
Charge Capacitance

Oxide Films on Stainless Steels★

CORROSION ◽  
1956 ◽  
Vol 12 (3) ◽  
pp. 41-53 ◽  
Author(s):  
THOR N. RHODIN
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Alloy Composition ◽  
Oxide Films ◽  
Film Structure ◽  
Passive Films ◽  
Film Properties ◽  
Film Composition ◽  
Corrosion Resistant ◽  
Compositional Properties

Abstract Oxide films on stainless steels have been classified into three types according to film thickness, film structure, film composition, and influence of the film on resistance to corrosion. Compositional properties of oxide films isolated from surfaces of stainless steels were studied using specially developed microanalytical techniques. Properties of passive films on stainless steel were evaluated and the effects of alloy composition and surface treatment on other types of films on Types 304, 316, and 347 stainless steels were studied. The influence of corrosion in various media was correlated with film compositional properties. Composition of films after immersion in acids was found to be related to film composition prior to immersion. The effect of immersion depended on the nature and intensity of corrosion and was reflected most sensitively by the iron and silicon contents of the films. The conclusion was made that film properties indicate strongly the capacity of austenitic stainless alloys to develop corrosion-resistant surfaces in certain environments.

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