Abstract
The structure and the composition of thin films obtained by vacuum co-evaporation of Co and TeO2 are studied by scanning and transmission electron microscopy, X-ray photoelectron spectroscopy and energy dispersive spectroscopy. Carbon coated mica is used as a substrate. It is shown that during vacuum deposition a chemical reaction between both substances take place resulting in the formation of CoO and Te phases, amorphous or nanocrystalline depending on the atomic ratio RCo/Te. The reaction proceeds until the complete oxidation of Co to Co2+ in the films with RCo/Te<2 or until the complete reduction of TeO2 to elemental Te in the films with RCo/Te>2. Upon subsequent treatment at 400°C the reaction proceeds until complete consumption of excess TeO2 in the films with RCo/Te<2 or excess of Co in the films with RCo/Te>2 and the formation of nanocrystals of Co3O4, Co6Te5O16 and CoTe2. A partial evaporation of Te takes also place.
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