Sintering Process Influence on Microstructure and Intergranular Impedance of Rare-Earth Modified BaTiO3- Ceramics
2011
Sintering process is a complex of different synergetic effects during the
ceramics materials consolidation. The microstructural level properties
control is very important as a stage in advanced materials prognosis. SEM
analysis of Yb/BaTiO3 doped ceramics showed that in samples doped with a low
level of dopant and sintered at higher temperatures the grain size ranged
from 10-60μm, while with the higher dopant concentration the grain size
ranged between 2-15μm. The morphology of sintered BaTiO3-ceramics grains
points out the validity of developing new structure analytical methods based
on different geometries of grains' model systems. The idea of electrical
properties of BaTiO3-ceramics being influenced by intergrain microcontacts
can be successfully followed if we start with the two-sphere Coble’s model
and also the correction of the Coble’s model. In this paper, the grains
contact models based on spherical, ellipsoidal and polyhedral geometries are
presented making a new modeling tool for structure research of
BaTiO3-ceramics materials. Intergranular impedance analysis of grains
clusters was also introduced. Obtained results enabled establishment of
interrelation between structural and electrical parameters.
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