Effect of cerium oxide (CeO₂) additives on the dielectric properties of BaTiO₃ceramics

Abstract

The effect of adding 0.05 to 16.2 mol.% CeO2 on the dielectric properties and loss tangent of sintered BaTiO3 was investigated at different temperatures. The permittivity increased with CeO2 additions up to 0.5 mol%, then decreased with increasing concentrations. In the samples doped with 5.6 and 16.2 mol.% CeO2 the curves show a slight increase in the permittivity with temperature, without any significant tendency to a peak value, down to room temperature. Smaller additions of CeO2 (0.05 to 2 mol.%) lower the Curie temperature to 92 degrees C. The loss tangent maximum (tan delta )max at the Curie temperature was less than 0.035 for pure BaTiO3 and 0.0120 for samples containing 16.2 mol.% CeO2. X-ray measurement shows that the lattice parameters change with the concentration of additive, the a axis expanded while the c axis shrank, approaching a cubic structure at room temperature for 5.6 mol.% CeO2(c/a=1.001249). Shrinking of the c axis reached its maximum at 16.2 mol.% CeO2 (c/a=0.994341).

Ceramics, Electronic

“…Additions of up to 0.5% CeO 2 increase the dielectric constant, but further additions lower it [57]. Many other additives also affect the dielectric properties of BaTiO 3 formulations.…”

Ultra‐Broad Temperature Stability Obtained with Ce‐Doped BaTiO3‐Based Ceramics

“…Rare‐earth oxide, which has intermediate ionic radius between Ba 2+ and Ti 4+ ions, is an important additive in BT‐based ceramics to improve dielectric properties, due to its substitution on Ba‐site or Ti‐site or both . Among the rare‐earth oxides, cerium oxide (CeO 2 ) as addition in BT has been studied to improve the temperature stability . In this study, CeO 2 was doped into the multicomponent BT‐based system to increase the ceiling temperature and improve the dielectric properties.…”

Effect of Low Temperature Annealing on Microstructural and Optical Properties of (BaTiO3)0.84(CeO2)0.16Thin Films

“…Cernea et al [8] observed that dielectric ceramics of Ce:BaTiO 3 present practical interest because addition of cerium decreases signicantly the Curie temperature (T C ) of BaTiO 3 . Issa et al [9] and Dughaish and Issa [10] showed that addition of low concentrations less than 5 mol.% CeO 2 to BaTiO 3 lattice lowered T C and the addition of 16 mol.% CeO 2 to BaTiO 3 smeared out T C and changed the structure from tetragonal phase into cubic phase at room temperature. This guided us to choose this system for this study because it has electrical permittivity higher than that of pure barium titanate, and its crystal structure (cubic [9]) will not change during operation since there is no transition temperature (the addition of CeO 2 smeared out the transition temperature T C [10]) and looks promising to have wide applications in electronics, optoelectronics, and gas sensing applications.…”

“…Issa et al [9] and Dughaish and Issa [10] showed that addition of low concentrations less than 5 mol.% CeO 2 to BaTiO 3 lattice lowered T C and the addition of 16 mol.% CeO 2 to BaTiO 3 smeared out T C and changed the structure from tetragonal phase into cubic phase at room temperature. This guided us to choose this system for this study because it has electrical permittivity higher than that of pure barium titanate, and its crystal structure (cubic [9]) will not change during operation since there is no transition temperature (the addition of CeO 2 smeared out the transition temperature T C [10]) and looks promising to have wide applications in electronics, optoelectronics, and gas sensing applications. * e-mail: zhdalmas45@gmail.com were characterized by X-ray diraction (XRD), scanning electron microscope (SEM), energy dispersive analysis of X-ray (EDAX) and spectroscopic ellipsometry (SE).…”