Abstract
MoO 3 is a lamellar material with applications in different areas, as solid lubricants, catalysis, solar cells, etc. In the present work, MoO 3 powders, synthesized by the polymeric precursor method, were doped with nickel or cobalt. The powder precursors were characterized by TG/DTA. After calcination between 500 and 700 °C, the samples were characterized by X-ray diffraction, infrared and Raman spectroscopy and scanning electron microscopy. β-MoO 3 was obtained after calcination at low temperatures. With the temperature increase, α-MoO 3 is observed, with a preferential growth of the (0 2 k 0) planes, when the material is doped and calcined at 700 °C. Doping with nickel increases five times the preferential growth. As a consequence, plate-like particles are observed.
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