Double exchange and electron hopping in magnetite

1969 ◽  
Vol 47 (21) ◽  
pp. 2309-2317 ◽  
Author(s):  
A. Rosencwaig
Keyword(s):  
Electrical Conductivity ◽  
Electron Transfer ◽  
Conduction Band ◽  
Transfer Process ◽  
Double Exchange ◽  
Real Sample ◽  
Electron Hopping ◽  
Electron Transfer Process ◽  
Octahedral Cation ◽  
Hopping Model

A Zener double-exchange model is formulated for magnetite and is used to describe the electron-hopping process. The main consequence of this model is that the electrons participating in the hopping process in any imperfect or nonstoichiometric (i.e. real) sample of magnetite can be regarded as being essentially localized to hopping within particular (Fe2+–Fe3+) octahedral cation pairs, and not as being in either some form of 3d conduction band or as participating in a nonlocalized electron-transfer process. Well-known results on the electrical conductivity, and new results with the Mossbauer effect in magnetite are then explained in terms of this pair-localized electron-hopping model.

Thionine–graphene oxide covalent hybrid and its interaction with light

2017 ◽  
Vol 19 (22) ◽  
pp. 14412-14423 ◽  
Author(s):  
Ewelina Krzyszkowska ◽  
Justyna Walkowiak-Kulikowska ◽  
Sven Stienen ◽  
Aleksandra Wojcik
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Excited State ◽  
Transfer Process ◽  
Singlet Excited State ◽  
Functionalized Graphene ◽  
Electron Transfer Process ◽  
Functionalized Graphene Oxide ◽  
Back Electron Transfer

Quenching of the thionine singlet excited state in covalently functionalized graphene oxide with an efficient back electron transfer process.

scholarly journals Electrokinetic and Impedimetric Dynamics of FeCo-Nanoparticles on Glassy Carbon Electrode

Nano Hybrids ◽  
2013 ◽  
Vol 3 ◽  
pp. 1-23 ◽  
Author(s):  
Chinwe O. Ikpo ◽  
Njagi Njomo ◽  
Kenneth I. Ozoemena ◽  
Tesfaye Waryo ◽  
Rasaq A. Olowu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Transfer Process ◽  
Dimethyl Carbonate ◽  
Electrochemical Impedance ◽  
Ethylene Carbonate ◽  
Carbon Electrode ◽  
Electron Transfer Process ◽  
Feco Nanoparticles

The electrochemical dynamics of a film of FeCo nanoparticles were studied on a glassy carbon electrode (GCE). The film was found to be electroactive in 1 M LiClO4 containing 1:1 v/v ethylene carbonate dimethyl carbonate electrolyte system. Cyclic voltammetric experiments revealed a diffusion-controlled electron transfer process on the GCE/FeCo electrode surface. Further interrogation on the electrochemical properties of the FeCo nanoelectrode in an oxygen saturated 1 M LiClO4 containing 1:1 v/v ethylene-carbonate-dimethyl carbonate revealed that the nanoelectrode showed good response towards the electro-catalytic reduction of molecular oxygen with a Tafel slope of about 120 mV which is close to the theoretical 118 mV for a single electron transfer process in the rate limiting step; and a transfer coefficient (α) of 0.49. The heterogeneous rate constant of electron transfer (ket), exchange current density (io) and time constant (τ) were calculated from data obtained from electrochemical impedance spectroscopy and found to have values of 2.3 x 10-5 cm s-1, 1.6 x 10-4 A cm-2 and 2.4 x 10-4 s rad-1, respectively.

scholarly journals Vibrational transition rule during a through-bond electron transfer process

2013 ◽  
Vol 567 ◽  
pp. 1-5 ◽  
Author(s):  
Serge Monturet ◽  
Mikaël Kepenekian ◽  
Roberto Robles ◽  
Nicolás Lorente ◽  
Christian Joachim
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Transition Rule ◽  
Vibrational Transition ◽  
Electron Transfer Process
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