【摘要】 采用传统固相合成法制备了BaTiO₃-SrCO₃-MgCO₃-Mn₃O₄-xDy₂O₃-ZrO₂-SiO₂陶瓷,其中x的取值范围为摩尔分数0～0.8%。该系列陶瓷以1320℃的温度在1%H₂+99%N₂混合还原气氛中烧结。系统研究了Dy₂O₃掺杂对纳米BaTiO₃基陶瓷的晶格变化、晶粒生长和介电性能的影响。结果表明,掺杂适量的Dy₂O₃有助于提升BaTiO₃陶瓷材料的介电常数、绝缘电阻率以及T_c峰值。最终,掺杂摩尔分数0.2%Dy₂O₃的BaTiO₃陶瓷样品表现出了高介电常数（ε_r=2914）、良好的绝缘电阻率(ρ_v=1.94×10¹¹Ω·cm)和低介质损耗（tanδ=0.7%）,且其温度特性符合EIA X7R标准(-55～125℃,ΔC/C_25℃≤±15%),表现出作为纳米BaTiO₃基电容器陶瓷材料的良好应用潜力。更多还原

【Abstract】 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 T_c peak of BaTiO₃ ceramic materials.Finally,the BaTiO₃ ceramic sample doped with 0.2%Dy₂O₃ exhibits a high dielectric constant（ε_r=2914）,good insulation resistivity(ρ_v=1.94×10¹¹Ω·cm)and low dielectric loss（tanδ=0.7%）,and its temperature characteristics meets the EIA X7R standard(-55-125℃,ΔC/C_25℃≤±15%),showing good application potential as a nano-BaTiO₃-based capacitor ceramic material.更多还原