Characteristics of Dy2O3-doped non-reducible nano BaTiO3-based ceramics
BaTiO3-SrCO3-MgCO3-Mn3O4-xDy2O3-ZrO2-SiO2 ceramics were prepared by traditional solid phase synthesis method,where the value of x ranges from 0 to 0.8％(mole fraction).This series of ceramics was sintered at 1320 ℃ in the 1％H2+99％N2 mixed reducing atmosphere.The effect of Dy2O3 doping on the lattice change,grain growth and dielectric properties of nano-BaTiO3-based ceramics was systematically studied.The results show that doping with an appropriate amount of Dy2O3 helps to improve the dielectric constant,insulation resistivity and Tc peak of BaTiO3 ceramic materials.Finally,the BaTiO3 ceramic sample doped with 0.2％Dy2O3 exhibits a high dielectric constant(e,=2914),good insulation resistivity(ρv=1.94×1011Ω·cm)and low dielectric loss(tanδ=0.7％),and its temperature characteristics meets the EIA X7R standard(-55-125 ℃,ΔC/C25℃ ≤±15％),showing good application potential as a nano-BaTiO3-based capacitor ceramic material.
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