Science of Sintering 2011 Volume 43, Issue 3, Pages: 277-287
https://doi.org/10.2298/SOS1103277M
Full text ( 862 KB)
Cited by
Sintering process influence on microstructure and intergranular impedance of rare-earth modified BaTiO3-ceramics
Mitic V.V. (Faculty of Electronic Engineering, Nis + Institute of Technical Science of SASA, Belgrade)
Paunovic V. (Faculty of Electronic Engineering, Nis)
Pavlovic V. (Institute of Technical Science of SASA, Belgrade + Faculty of Agriculture, Belgrade)
Zivkovic Lj. (Faculty of Electronic Engineering, Nis)
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.
Keywords: BaTiO3, microstructure, sintering, intergranular impedance, Coble’s model