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Sar, Jarosław
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article
Synthesis and structural study of a self-organized MnTiO3-TiO2 eutectic
Abstract
A microstructured manganese titanate - titanium dioxide, MnTiO3-TiO2, hybrid eutectic has been grown by the micro-pulling-down method from a TiO2 57 mol.% - MnO 43 mol.% composition. X-ray powder diffraction verifies that two phases have been formed: rhombohedral MnTiO3 and tetragonal TiO2. The TiO2 phase forms a three-dimensional network of micron-scale oval precipitates interconnected with c.a. 0.5 mu m in thickness lamellas and the MnTiO3 is the matrix phase. The two TiO2 precipitate types grow in different crystallographic orientations, which results in this complex geometry made of faceted and non-faceted inclusions. The lamellas grow in the [010] orientation in which a 2-fold axis is present, while the oval precipitates grow in the [001] orientation in which the 4-fold screw axis is present. A qualitative and quantitative analysis of the eutectic microstructure is presented. The MnTiO3-TiO(2)composite is interesting due to its potential application in photoelectrochemistry.