nedelja, 17 dec 2017

Original scientific paper
UDC:  662.756.3:620.91
DOI: 10.7251/afts.2016.0814.047M
COBISS.RS-ID 5845528
Mitić V. Vojislav1,2, Kocić Ljubiša1, Paunović Vesna1, Bastić Filip1,2

ABSTRACT  Full text (pdf)

Doped ceramics materials structure can be controlled using different synergetic effects as well as consolidation parameters. Additives concentration influence on ceramics microstructure and dielectric properties, based on fractal geometry, is analyzed. These properties level control level is very important in advanced materials prognosis. The Coble's two-sphere model is used as initial one, for developing a new two-ellipsoid model; unlike the spherical geometry, the ellipsoidal-polyhedral geometry,besides better approximation of sintering particles, is in relation with consolidation parameters (sintering time and temperature). The experiments have been based on BaTiO3 with different additives (CeO2, MnCO3, Bi2O3, Fe2O3, Nb2O5, CaZr2O3, Er2O3, Yb2O3, Ho2O3), concentration from 0.01wt% to 1wt%, consolidated under the pressing pressure up to 150 MPa and 1180°C-1380°C sintering temperatures, are used. We performed SEM and EDS analysis. 
The fractal nature offers a new approach for the ceramics structure analysis, describing, prognosis and modeling the grains shape and relations between ceramics structure and electric-dielectric properties. The microstructure has a great importance from different alternative energies points of view. World’s interest race in renewable and new generation energy sources development, especially the new batteries systems, are in research and development focus, simultaneously, in the electric cars technologies development. Beside the electrochemical processes and rechargeable speed, the storage capacity has special significance which is enriched by the fractal natureanalysis and these scientific paper contributions with some fundamental electrochemical laws through fractal corrections expressed by the relevant formulas. These are the new frontiers in direction of electrochemical fractal microelectronics. Also, the wind energy as new and alternative energy source has important role growing. 
The land and obstacles of fractal nature, influence on air/wind turbulence towards the wind generators propellers, has special effect on the wind speed, described by the logarithmic law equation which is deduced from the similarity theory that is strictly applicable to steady-state horizontally homogeneous conditions in the surface layer. So, definitely in this paper the fractal nature independently existing everywhere within the structures, contact surfaces, practically, from microstructures, even on nano level up to global bulk and massive shapes, fractal nature ceramics materials existence is completely confirmed within the electrochemical thermodynamic and fluid dynamics parameters, are confirmed.
Key words: alternative energy, BaTiO3-ceramics, Coble’s model, microstructure, fractals, electrochemical energy, wind generators.



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