Low temperature sintering of BZT-BCT using alkalifree glass additives and its dielectric property

Abstract

Low temperature sintering of 0.5Ba(Zr0.2Ti0.8)O3– 0.5(Ba0.7Ca0.3)TiO3 [BZT-BCT] was studied using two different glass additive namely, strontium borate (SrB4O7) and BaO,SiO2,.B2O3. First, single phase BZT–BCT powders were prepared by conventional solid state reaction technique at 1200oC. It was observed that strontium borate is not an effective sintering additive for BZT–BCT. BZT–BCT can be successfully sintered to more than 94% of theoretical density at 1150oC with BaO,SiO2,.B2O3 glass additive, whereas the conventional sintering temperature is around 1400oC. The relative permittivity of such low-temperature sintered samples was reduced compared to BZT-BCT samples prepared via conventional sintering at a high temperature. It is also found that the addition of BaO,SiO2,.B2O3 glass additive promotes grain growth.