Abstract
We have made investigations of the phase formation and microstructure on the ceramics obtained from a starting nanopowder mixture with the weight ratio ZnO : TiO2 = 4 : 1. Ceramic is obtained at different sintering temperatures, namely, 948, 1223 and 1473 ?. Using the characterization methods of electron microscopy, energy dispersive microanalysis and X-ray diffraction phase analysis it has been shown that the ceramics structure is consisted of two dispersed phases of Zn2TiO4 and ZnO with the grain sizes being in range 0,5-1 ?m. It has been found also that, at ceramic`s sintering temperature of 1223 ?, the solid phase interactions are completed with the structure ZnO : Zn2TiO4 ? 1 : 1,5 phase ratio.
Highlights
Nanostructures based on zinc and titanium oxides attract attention due to their peculiar structural, optical, optoelectronic and other characteristics
Observed two phase ceramics were obtained by solid phase sintering of the nanopowder mixture of ZnO and TiO2
The initial stage of sintering is found to be at 948 К and it is declared with forming neck contacts between dispersed powder particles inside the nanopowder agglomerates
Summary
Nanostructures based on zinc and titanium oxides attract attention due to their peculiar structural, optical, optoelectronic and other characteristics. Compounds based on ZnO-TiO2 (zinc titanates) are technologically important since they possess specific properties hardly obtained using solely ZnO. In the ZnO–TiO2 system six chemical compounds of various types are formed, where ortho- and metatitanate are the best studied [4,5,6]. Zinc orthotitanate Zn2TiO4 occurs in the form of crystals having cubic regular octahedra structure with the lattice parameter being а = 0,846 nm. The obtained compounds of zinc orthotitanate are found to be stable to temperature changes. Zinc metatitanate ZnTiO3 occurs as hexagonal system crystals – ilmenite wit the lattice parameters being а = 0,508 nm and с = 1,392 nm
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