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2 Materials Science Poland

2 2020

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Influence of cation order on the dielectric properties of (1 – x)Pb(Sc0.5Nb0.5)O3-xPb(Yb0.5Nb0.5)O3 ceramics

Garbarz-Glos Barbara, Bąk Wojciech, Antonova Maija, Kalvane Anna, Kajtoch Czesław, Dulian Piotr

Materials Science Poland

2020

Vol. 38, No. 3

402--406

Ceramic lead niobates and their solid solutions of (1 – x)Pb(Sc0.5Nb0.5)O3-xPb(Yb0.5Nb0.5)O3 were synthesized by solid state reactions from oxides. The structure of investigated samples was characterized by X-ray diffraction (XRD). Dielectric studies of the ceramics were performed by means of broadband dielectric spectroscopy at the temperature ranging from 600 K to 140 K. For all ceramic samples a diffuse phase transition as well as relaxor ferroelectric behavior were observed.

Effect of titanium source and sol-gel TiO2 thin film formation parameters on its morphology and photocatalytic activity

Dulian Piotr, Zajic Jan, Żukowski Witold

Materials Science Poland

2020

Vol. 38, No. 3

424--433

TiO2 thin films with different surface structure have been prepared from alkoxide solutions by the sol-gel method using different cationic precursors and heat treatment techniques. The effect of using titanium isopropoxide as well as titanium butoxide as a titanium source on the surface structure and photocatalytic activity of the resultant thin films was studied. Significant differences in the rate of hydrolysis and condensation reactions during the sol-gel synthesis were observed for these titanium precursors. This had a direct influence on the morphology of the as-prepared TiO2 films. Higher quality oxide coatings were obtained from titanium isopropoxide. They were characterized by a smaller grain size, improved surface roughness and uniform coverage of the glass substrate. A beneficial effect of calcination process after each sol application cycle in contrast to single step calcination after all dip-coating cycles was observed. Photocatalytic degradation tests showed that methyl orange was decolorized in the presence of all prepared TiO2 films by exposing their aqueous solutions to UV light (λ = 254 nm). The highest photocatalytic activity had the TiO2 layer produced using titanium isopropoxide.