Study On Dielectric-temperature Stability Of BaTiO₃based Ceramic Materials And Transition To High-k Materials

Along with the computer,communications and consumer electronic products rapiddeveloping, the developing of Multilayer ceramic capacitors（MLCC） was rapidlypromoted.Barium titanate BaTiO₃is a typical dielectric material in environmentally friendlyprojects,which is becoming research hotspot with its peculiar ferroelectric piezoelectric anddielectric properties.In this work,according to the vacancy Ba-site or Ti-site defect compensationmechanism,we adopted Nb and Co co-doped,Cr-doped and Eu-doped barium titanate （BaTiO₃）ceramics by traditional ceramic sintering process to explore synthesis conditions and rules oftemperature-Stable Dielectric ceramic Materials in the System BaTiO₃-Nb₂O₅-Co₂O₃and Cr-BaTiO₃and High-k Eu-doped Barium Titanate Ceramics. BaTiO₃-based ceramic materials ofartificially Synthesized,which were measured by X-ray diffraction （XRD）,scanning electronmicroscope （SEM）, dielectric permittivity test system DPT detecting lattice parameter,grainsize,dielectric properties,respectively,and further studied the effect of Dielectric propertiesand microscopic structure of rare-earth-doped BaTiO₃-based ceramic materials in order todevelop temperature-Stable Dielectric NC,Cr-BT of meeting dielectric specification of‘X5R,X7R,X8R’ and High-k BE5T ceramic Materials.Results show that Nb and Co co-doped BaTiO₃-based ceramic and Cr-doped BaTiO₃-basedceramic of different valence state further improve dielectric properties of BaTiO₃which madeMore gentle dielectric temperature cure,lower dielectric loss,more diffuse dielectricpeak.Finally,we got the temperature-Stable dielectric ceramic Materials in environmentallyfriendly projects of meeting dielectric specification of Electronic Industries Association （EIA）of ‘X5R,X7R,X8R’ and obtained material property and formation mechanism of Eu-dopedBaTiO₃-based ceramic in different Synthesis temperature.