AMORPHOUS TRANSITION METAL OXIDES

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Abstract
The semiconducting properties of Transition Metal Oxide (T.M.O.) glasses have been known for almost 30 years, since the pioneering work of Denton et al in 1954 (1). They have been extensively studied and recently reviewed by Mackenzie et al (2) (3). Their specific properties arise from the fact that transition metal ions may exhibit several valence states (V4+-V5+, W5+-W6+) so that electron transfer from low to high valence states can take place. This electron transfer can be either optically or thermally activated and T.M.O. glasses will exhibit both optical and electrical properties

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