Electronic ceramics fractal microstructure analysis - Minkowski Hull and grain boundaries

Reference	Presenter	Authors (Institution)	Abstract
08-143	Vojislav V Mitic	Mitic, V.V.(Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade); Kocic, L.(Faculty of Electronic Engineering, University of Nis,); Paunovic, V.V.(Faculty of Electronic Engineering, University of Nis, Serbia,); Fecht, H.(Materials Division, University of Ulm, 89081 Ulm, Germany); Veljkovic, S.(Faculty of Electronic Engineering, University of Nis, Serbia); Lazovic, G.(University of Belgrade, Faculty of Mechanical Engineering, Belgrade);	Technological parameters and different additives can be used to control structure of BaTiO3 based materials. In this paper, microstructure and dielectric properties of Yb2O3 doped BaTiO3-ceramics, sintered from 1320 oC to 1380 oC have been investigated. Micro¬structural investigations were carried out using scanning electron microscope equipped with energy dispersive spectrometer. The quantitative metallography method is used for grain size distribution determining. The new correlation between microstructure and dielectric properties of doped BaTiO3-ceramics, based on fractal geometry and micro-contact surfaces, has been developed. Using the fractal descriptors of the grains contact surface, a reconstruction of microstructure configurations, as grains shapes or intergranular contacts, has been successfully done. Obtained results indicated that fractal analysis contact surfaces descriptors of different shapes were very important for the prognosis of BaTiO3-ceramics microstructure and dielectric properties. The morphology of ceramics grains pointed out the validity of developing new structure analytical methods, based on different grains’ shape geometries. The grains contact model based on Minkowski hull is presented as new modeling tool for structure research of BaTiO3-ceramics materials. The directions of possible materials properties prognosis are determined according to the correlations synthesis–structure–property. The fractal based approach to the investigation of BaTiO3-ceramic grains concerning the relationship between the temperature and the area of the contact surface is also introduced.
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