The effects of composition and microstructure on electrical degradation in BaTiO₃

Electrical Properties of Acceptor Doped BaTiO3

“…However, the specimen equally co-doped with 0.5 mol% Mg and Mn showed higher leakage currents and failure occurred earlier than the un-doped BaTiO 3 . The high leakage current with short lifetime of 0.5 mol% Mg-doped BaTiO 3 is due to the electro-migration of oxygen vacancy from anode to cathode under the continuous dc field [12][13][14][15]. This result demonstrates that leakage currents of acceptor doped BaTiO 3 under dc field are effectively suppressed by Mn doping as long as the Mn doping level is greater than Mg contents.…”

“…The increase in oxygen vacancy suppresses the reduction of BaTiO 3 specimens and moves the n-type range to lower Po 2 , resulting in the highly insulating p-type material. However, the oxygen vacancy is the most mobile species in BaTiO 3 lattices and the electromigration of charged oxygen vacancies in dc field is accountable for the electrical degradation of BaTiO 3 -based ceramic capacitors [12][13][14][15].…”

Defects and Degradation of BaTiO3 Codoped with Dy and Mn

“…12,13) TiO 2 -rich compositions degrade more rapidly than BaO-rich samples. 12) One of the most common degradation processes is attributed in part to oxygen vacancy motion and a decrease in insulating resistance.…”

“…12,13) TiO 2 -rich compositions degrade more rapidly than BaO-rich samples. 12) One of the most common degradation processes is attributed in part to oxygen vacancy motion and a decrease in insulating resistance. [14][15][16][17] The oxygen vacancy with a positive effective charge is doubly ionized with respect to the neutral lattice and is considered to be the most mobile ionic defect in these materials.…”

Water‐Induced Degradation of Barium Titanate Ceramics Studied by Electrochemical Hydrogen Charging

“…It has been reported in the literature that the A/B ratio of perovskite ABO 3 has an important influence on degradation behavior. 14,15 Therefore, a further study is being conducted to investigate water-induced degradation in BTO ceramics with various Ba/Ti ratios. Another study in progress is to compare water-induced degradation in SrTiO 3 ceramics and single crystals, which provides an insight into the diffusion path of hydrogen and the distribution of hydrogen between grains and grain boundaries.…”