Open AccessSolid state synthesis of extra phase-pure Li4Ti5O12 spinel
Author(s) -
Ivana Veljković,
Dejan Poleti,
Ljiljana Karanović,
Miodrag Zdujić,
Goran Branković
Publication year - 2011
Publication title -
science of sintering/science of sintering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.309
H-Index - 25
eISSN - 1820-7413
pISSN - 0350-820X
DOI - 10.2298/sos1103343v
Subject(s) - spinel , materials science , anatase , chemical engineering , monoclinic crystal system , annealing (glass) , particle size , thermal decomposition , phase (matter) , mineralogy , crystallography , crystal structure , metallurgy , chemistry , catalysis , organic chemistry , photocatalysis , engineering
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