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BaTi03 nanotubes obtained by template method

Szafraniak I., Jakubowicz J., Połomska M.

Inżynieria Materiałowa

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2007

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Vol. 28, nr 3-4

339-341

EN

Ferroelectric BaTiC>3 nanotubes have been obtained using template-mediated method. Ordered porous silicon was applied as the template. Fluid precursor wets the pore walls forming continuous thin layer. After high-temperature treatment the amorphous layer crystallizes and structural investigation proves its perovskite structure. Than the silicon template has been removed by etching of silicon. As the results free nanotubes have been obtained. Their physical properties have been investigated by X-ray diffraction, electron microscopy and Raman spectroscopy.

PL

Ferroelektryczne nanorurki BaTi03 otrzymane zostały metodą matrycową. Jako matryce wykorzystany został porowaty krzem o regularnym układzie porów. Płynny komercyjny prekursor zwilżając powierzchnie porów tworzy cienką warstwę. Po usunięciu części organicznych prekursora i wykrystalizowaniu amorficznego materiału otrzymane zostały nanorurki o strukturze perowskitu. Następnie matryca krzemowa została usunięta w wyniku trawienia. Uzyskano w ten sposób swobodne nanorurki, których własności fizyczne badane były metodą rentgenowską, mikroskopią elektronową i spektroskopią ramanowską.

2

Structural phase transitions and their influence on Cu+ mobility in superionic ferroelastic Cu6PS5I single crystals

Gągor A., Pietraszko A., Drozd M., Połomska M., Kaynts D.

Materials Science Poland

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2006

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Vol. 24, No. 1

237--243

EN

The structural origin of Cu+ ion conductivity in Cu6PS5I single crystals is described in terms of structural phase transitions studied by X-ray diffraction, polarized light microscopy and calorimetric measurements. Below the phase transition temperature at Tc = (144-169) K, Cu6PS5I belongs to the monoclinic, ferroelastic phase, with the space group Cc. Above Tc, the crystal changes its symmetry to a cubic superstructure, with the space group F43c (a' = 19.528); finally, at 274 K, the disordering of Cu+ ions increases to the symmetry F43m (a = 9.794). The phase transition at 274 K coincides well with a strong anomaly in electrical conductivity observed on the Arrhenius plot. Diffusion paths for Cu+ ions are evidenced by means of atomic displacement factors and a split model. The influence of copper stoichiometry on Tc is also discu

3

Aggregation of Some TTF Derivatives and Their Adducts with C60

Olejniczak I., Kędziora P., Bogucki A., Połomska M., Graja M.

Polish Journal of Chemistry

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2003

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Vol. 77 / nr 11

1473-1482

EN

Spectral investigations of selected tetrathiafulvalene-derived donor molecules (TTFs) and the fullerene-derived adducts with these donors linked to them were performed. The main attention has been devoted to studies of possible intermolecular interactions, in particular to aggregation processes in these materials.