The influence of Cu2+ ions on the ionic, electronic conductivity and optical characteristics of Li2O-SrO-B2O3 system

2022 ◽  
Vol 575 ◽  
pp. 121210
Author(s):  
A. Ramesh Babu ◽  
S. Yusub ◽  
V. Aruna ◽  
N. Sree Ram ◽  
P.M. Vinaya Teja ◽  
...  
2018 ◽  
Vol 106 (1) ◽  
pp. 107 ◽  
Author(s):  
Jean- Louis Crolet

All that was said so far about passivity and passivation was indeed based on electrochemical prejudgments, and all based on unverified postulates. However, due the authors’ fame and for lack of anything better, the great many contradictions were carefully ignored. However, when resuming from raw experimental facts and the present general knowledge, it now appears that passivation always begins by the precipitation of a metallic hydroxide gel. Therefore, all the protectiveness mechanisms already known for porous corrosion layers apply, so that this outstanding protectiveness is indeed governed by the chemistry of transport processes throughout the entrapped water. For Al type passivation, the base metal ions only have deep and complete electronic shells, which precludes any electronic conductivity. Then protectiveness can only arise from gel thickening and densification. For Fe type passivation, an incomplete shell of superficial 3d electrons allows an early metallic or semimetallic conductivity in the gel skeleton, at the onset of the very first perfectly ordered inorganic polymers (- MII-O-MIII-O-)n. Then all depends on the acquisition, maintenance or loss of a sufficient electrical conductivity in this Faraday cage. But for both types of passive layers, all the known features can be explained by the chemistry of transport processes, with neither exception nor contradiction.


2018 ◽  
Vol 138 (11) ◽  
pp. 509-515
Author(s):  
Kenzo Yamaguchi ◽  
Tatsuki Nakamoto ◽  
Masamitsu Fujii

2014 ◽  
Vol 29 (10) ◽  
pp. 1039
Author(s):  
TAN Man-Lin ◽  
WANG Yan-Tao ◽  
ZHANG Wei-Li ◽  
FU Dong-Ju ◽  
LI Dong-Shuang ◽  
...  

2019 ◽  
Vol 34 (2) ◽  
pp. 255-261 ◽  
Author(s):  
S. A. Nouh ◽  
A. Abou Elfadl ◽  
K. Benthami ◽  
A. A. Alhazime

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