Ceramics materials structures, energy and fractal

Reference Presenter Authors
08-142 Vojislav V Mitic Mitic, V.V.(Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade); Paunovic, V.V.(Faculty of Electronic Engineering, University of Nis, Serbia,); Lazovic, G.(University of Belgrade, Faculty of Mechanical Engineering, Belgrade); Kocic, L.(Faculty of Electronic Engineering, University of Nis,); Vlahovic, B.(North Carolina Central University, USA); Veljkovic, S.(Faculty of Electronic Engineering, University of Nis, Serbia); The orderly packed atomic structures suits Euclidian geometry, up to the nano sizes, but it is not suitable for rather characterized particles flows and irregular structures. In order to analyse these structures, authors proposed fractal approach. The notable trend in the recent literature is that a wide range of disordered systems, e.g., linear and branched polymers, biopolymers and percolation clusters can be characterized by the fractal nature over a microscopic correlation length. It is favourable to the fact that energy transformations are permitted on a small scale. The modern Material Science faces with very important priorities of the future new frontiers which opens new directions within higher and deeper structure knowledge even down to nano and due to lack of energy, towards new and alternative energy sources. For ex., through our up today research we recognize that BaTiO3 and other ceramics have fractal configuration nature based on three different phenomena. First, ceramic grains have fractal shape seeing as a contour in cross section or as a surface. Second, there are so called “negative space” made of pores and inter-granular space. Being extremely complex, the pore space plays an important role in microelectronics, micro-capacity, PTC, piezoelectric and other phenomena. Third, there is Brownian process of fractal motions inside the material during and after sintering in the form of micro-particles flow: ions, atoms and electrons. The stress in this note is set on inter-granular micro-capacity and super micro-capacitors in function of higher energy harvesting and energy storage. An attention is paid to components affecting overall impedances distribution. Con¬struc-tive fractal theory allows recognizing micro-capacitors with fractal electrodes. The method is based on iterative process which is compatible with the model of grains itself. Inter-granular permeability is taken as a function of temperature as fundamental thermodynamic parameter.
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