摘要
(Ba(0.6) Sr(0.4))(0.85) Bi(0.1) TiO3 ceramics doped with x wt%CaZrO3(x= 0-10) were synthesized by solid-state reaction method. The effects of CaZrO3 amount on the dielectric properties and structure of(Ba(0.6)Sr(0.4))(0.85) Bi(0.1) TiO3 ceramics were investigated. X-ray diffraction results indicated a pure cubic perovskite structure for all samples and that the lattice parameter increased till x=5 and then slightly decreased. A homogenous microstructure was observed with the addition of CaZrO3. Dielectric measurements revealed a relaxor-like characteristic for all samples and that the diffusivity γ reached the maximum value of 1.78 at x=5. With the addition of CaZrO3, the dielectric constant dependence on electric field was weakened, insulation resistivity enhanced and dielectric breakdown strength improved obviously and reached 19.9 k V/mm at x=7.5. In virtue of low dielectric loss(tan d〈0.001 5), moderate dielectric constant(er 〉1 500) and high breakdown strength(Eb 〉17.5 k V/mm), the CaZrO3 doped(Ba(0.6)Sr(0.4))0.85 Bi(0.1) TiO3 ceramic is a potential candidate material for high power electric applications.
(Ba(0.6) Sr(0.4))(0.85) Bi(0.1) TiO3 ceramics doped with x wt%CaZrO3(x= 0-10) were synthesized by solid-state reaction method. The effects of CaZrO3 amount on the dielectric properties and structure of(Ba(0.6)Sr(0.4))(0.85) Bi(0.1) TiO3 ceramics were investigated. X-ray diffraction results indicated a pure cubic perovskite structure for all samples and that the lattice parameter increased till x=5 and then slightly decreased. A homogenous microstructure was observed with the addition of CaZrO3. Dielectric measurements revealed a relaxor-like characteristic for all samples and that the diffusivity γ reached the maximum value of 1.78 at x=5. With the addition of CaZrO3, the dielectric constant dependence on electric field was weakened, insulation resistivity enhanced and dielectric breakdown strength improved obviously and reached 19.9 k V/mm at x=7.5. In virtue of low dielectric loss(tan d〈0.001 5), moderate dielectric constant(er 〉1 500) and high breakdown strength(Eb 〉17.5 k V/mm), the CaZrO3 doped(Ba(0.6)Sr(0.4))0.85 Bi(0.1) TiO3 ceramic is a potential candidate material for high power electric applications.
基金
Funded by the National Natural Science Foundation of China(No.51302093)
the Fundamental Research Funds for the Central Universities of China(Nos.2014TS046,2015MS017)