Characterization of Internal Capacitors Based on Glass-Added Barium Titanate

Abstract

Barium–calcium–aluminum–borosilicate glass is added as a sintering promoter to reduce the sintering temperature of barium titanate. The dielectric properties of the glass-added barium titanate-based internal capacitors are investigated. The dielectric constants of the composites were found to increase with sintering temperature. A capacitance of about 2.3 nF/cm2 with the dissipation factor of 2.9% is obtained for a 20 wt% glass-added BaTiO3 internal capacitor after being cofired with low dielectric constant ceramic substrate at 950°C. The percent change of capacitance is confined within ±10% and the dissipation factor is stable in the measured temperature range.

Characteristics of BaO–B2O3–SiO2 nano glass powders prepared by flame spray pyrolysis as the sintering agent of BaTiO3 ceramics

“…However, in order to achieve BaTiO 3 with a high density and high dielectric constant, high sintering temperatures above 1300 • C is required. At present, adding glass with a low melting point is an effective and inexpensive way to reduce the sintering temperature of BaTiO 3 -based ceramics [3][4][5][6][7][8][9]. Jeon et al showed the effects of BaO-B 2 O 3 -SiO 2 glass additive on densification and dielectric properties of BaTiO 3 ceramics started from hydrothermally synthesized nano-sized BaTiO 3 powders (∼60 nm) [5].…”

“…After milling process followed the post-treatment process, nano-sized BaTiO 3 powders with non-aggregation characteristics could be obtained [15,16]. However, micron or submicron size glass powders with irregular morphology prepared by conventional melting process have been mainly used to decrease the sintering temperature of BaTiO 3 ceramic [3][4][5][6][7][8][9]. Nanosized glass powders have not been applied as the sintering agent for BaTiO 3 ceramics.…”