Influence of BaO-CaO-SiO₂on dielectric properties and reliability of BaTiO₃-based ceramics

Abstract

The dielectric properties and resistance degradation behavior of BCG‐doped BaTiO3‐based ceramics were investigated, where BCG consists of BaO, CaO, and SiO2. In oxide ceramics, oxygen vacancies have an important effect on degradation behaviors. X‐ray diffraction was employed to analyze the occupancy of Ca2+ in the Ba sites or Ti sites with different BCG contents. For the light‐doped, Ca2+ mainly occupy the Ba sites resulting in a decrease of lattice parameters and thus an increase in the enthalpy of reduction which might limit the concentration of oxygen vacancies. However, acceptor defects, Ca″Ti which could trap the forming electrons at room temperature but deteriorate the resistance degradation behavior at high temperature, would be generated with excessive BCG contents. Moreover, thermally stimulated depolarization current (TSDC) analysis was carried out to analyze the defect relaxation behavior and the actual concentration. The resistance degradation can be correlated with the depolarization current strength (Jmax) and the relaxation temperature (Tm) versus polarization condition.

Effect of Ho‐Dy co‐doping on the electrical properties and reliability of BaTiO3‐based nanoceramics for Base Metal Electrode Multilayer Ceramic Capacitor

“…Ca and Ba could adjust the ratio of A/B in doped BaTiO 3 since Ca 2+ could substitute Ba 2+ or Ti 4+ under different conditions to improve the dielectric properties of ceramics 27 . SiO 2 was added to reduce the sintering temperature of ceramics 28 . Four groups of samples were designed and they were named as BT‐2HD, BT‐4HD, BT‐6HD, and BT‐8HD with the co‐doping concentration of Ho and Dy increasing from 0.2, 0.4, 0.6 to 0.8 mol%.…”

A Review on the Conventional Capacitors, Supercapacitors, and Emerging Hybrid Ion Capacitors: Past, Present, and Future

“…[ 10–13 ] Furthermore, a large number of lead‐free dielectrics continually emerged when considering the toxicity of lead. [ 14–17 ] Up to now, the dielectrics with high permittivity and breakdown strength are still in intense research. Regarding the supercapacitors, the carbon materials with high specific surface area were bearing the brunt.…”

The Effect of PVA Binder Solvent Composition on the Microstructure and Electrical Properties of 0.98BaTiO3-0.02(Ba0.5Ca0.5)SiO3 Doped with Dy2O3

“…In this study, BaTiO 3 ceramics with 0.02 mol of (Ba 0.5 Ca 0.5 )SiO 3 were used as the base dielectric material. The addition of 2mol% (Ba 0.5 Ca 0.5 )SiO 3 controlled the highly densified microstructure of the specimens in the sintering step and improved the insulation resistance of the sintered specimens [7]. To investigate the substitutional effect of Dy 3+ ions on the dielectric properties of the BaTiO 3 -based ceramics, the Dy 2 O 3 content of the specimens was varied from 0.0 to 0.3 wt.% to eliminate the effect of Dy 2 O 3 as the secondary phase on the microstructural characteristics of the ceramics [8,9].…”