As the SiO2 content was increased, powder dispersion was improved because the coated silica layer has an electrostatic repulsion effect on the surface of BaTiO3 particles. BaTiO3 specimens coated with greater than 1.0 wt.% SiO2 showed a second phase, Ba2TiSi2O8 at ∼800 °C. The specimen coated with 5.0 wt.% silica exhibited a slight shrinkage around 800 °C due to the reaction between SiO2 and BaTiO3 matrix. At higher sintering temperatures, exaggerated grain growth was observed as SiO2 content was increased. At 1250 °C, the density increased as the content of SiO2 was raised up to 0.5 wt.%, and then the density decreased rapidly because of swelling at 5.0 wt.% SiO2. Swelling of BaTiO3 with greater than 3.0 wt.% SiO2 is assumed due to the increase in liquid phase content, the different solubility of glass and sintering condition. The uncoated BaTiO3 showed the highest dielectric constant over the temperature range studied, and the samples with greater than 1.0 wt.% SiO2 exhibited lower dielectric values. This is due to the second phase, large pores and large grains.