The effect of adding 0.05 to 16.2 mol.% CeO
2 on the dielectric properties and loss tangent of
sintered BaTiO
3 was investigated at different temperatures. The
permittivity increased with CeO
2 additions up to 0.5 mol%, then decreased with
increasing concentrations. In the samples doped with 5.6 and 16.2
mol.% CeO
2 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 CeO
2 (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 BaTiO
3 and 0.0120 for samples containing 16.2 mol.% CeO
2. 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....