Redox Behavior of VI B Transition Metal Ions in Rutile TiO2 Solid Solutions: An XRD and EPR Study

2000 ◽  
Vol 152 (2) ◽  
pp. 412-420 ◽  
Author(s):  
Dante Cordischi ◽  
Delia Gazzoli ◽  
Manlio Occhiuzzi ◽  
Mario Valigi
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Solid Solutions ◽  
Transition Metal Ions ◽  
Redox Behavior ◽  
Rutile Tio2

Redox behavior of transition metal ions in zeolites. I. Reversibility of the hydrogen reduction of copper Y zeolites

1975 ◽  
Vol 79 (22) ◽  
pp. 2388-2394 ◽  
Author(s):  
R. G. Herman ◽  
J. H. Lunsford ◽  
H. Beyer ◽  
P. A. Jacobs ◽  
J. B. Uytterhoeven
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Hydrogen Reduction ◽  
Transition Metal Ions ◽  
Redox Behavior ◽  
Y Zeolites

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

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