Structure and properties of plasma sprayed BaTiO3 coatings: Spray parameters versus structure and photocatalytic activity

The phase composition, optical properties and photocatalytic activity of BaTiO3 coatings prepared by atmospheric plasma spraying were investigated. The spraying was carried out using a direct current gas-stabilised plasma gun. BaTiO3 was fed into the plasma jet as a feedstock powder prepared by a re...

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Bibliographic Details
Published in:Ceramics international 2011-09, Vol.37 (7), p.2561-2567
Main Authors: Ctibor, Pavel, Ageorges, Helene, Stengl, Vaclav, Murafa, Nataliya, Pis, Igor, Zahoranova, Tatiana, Nehasil, Vaclav, Pala, Zdenek
Format: Article
Language:English
Subjects:
Barium titanates
Coatings
Phase composition
Photocatalysis
Plasma spraying
Sintering
Sprays
Titanium dioxide
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Summary:The phase composition, optical properties and photocatalytic activity of BaTiO3 coatings prepared by atmospheric plasma spraying were investigated. The spraying was carried out using a direct current gas-stabilised plasma gun. BaTiO3 was fed into the plasma jet as a feedstock powder prepared by a reactive sintering of micron-sized powders of BaCO3 and TiO2. The microstructure and phase composition are reported and discussed in connection with the optical properties and photocatalytic activity. The colour of the sprayed coatings was different for each spray distance and also differed from sintered BaTiO3. An amorphous fraction was observed in the coatings. The hydrogen content was higher in the coatings than in the sintered bulk materials. The diffuse reflectance was measured by UV-VIS spectrophotometry and corresponding band-gap energies were estimated. XPS confirmed the stoichiometric and structural disorder observed by Raman spectroscopy. HR-TEM images for crystalline and amorphous zones are given. Photocatalytic decomposition of acetone was tested and the BaTiO3 coatings were compared with sintered bulk materials.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2011.04.003