Structural investigations and colour centres in MoO3films deposited by vacuum evaporation

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Abstract
Structural investigations concerning colour centres in MoO3 are described. The structure of MoO3 is studied by electron diffraction and by X-ray diffraction (powder technique). The films are coloured thermally, optically (UV), and electrically. During the crystallization process, the dangling bonds tend to connect the constituent atoms with neighbouring bonds. Heat is expected to be generated at the interface between the crystalline and amorphous regions during crystallization. The crystal grows by coalescence with neighbouring crystallites as a result of the heat treatment process. A blue colouration is caused by inter-electron transfer from an oxygen (2p) to a molybdenum (4d) orbital that creates an isolated Mo(V) oxidation state.

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