学术论文

      纳米Dy2O3掺杂BCTZ压电陶瓷的电学性能

      Nano-Sized Dy2O3 Doping on BCTZ Ceramics and the Electrical Properties

      摘要:
      采用共沸蒸馏沉淀法制备了平均粒径为16nm,分散性良好的Dy2O3纳米粉体.将纳米粉体按照0.5%,1.0%的比例掺入Ba0.85Ca0.15(Ti0.9Zr0.1)O3(BCTZ)中,在1 480℃,1 490℃的温度下固相烧结2h得到纳米Dy2O3掺杂的Ba0.85Ca0.15(Ti0.9Zr0.1)O3无铅压电陶瓷(BCTZ-Dy).XRD分析表明,掺杂纳米Dy2O3没有改变纯BCTZ陶瓷的钙钛矿结构.陶瓷的致密度均大于93.66%.BCTZ-Dy陶瓷的室温介电常数和介电损耗均随频率的增加而降低,表现出明显的频率弥散现象和介电峰宽化的弥散相变特征,表明该陶瓷样品为弛豫铁电体.纳米Dy2O3的加入使BCTZ的临界温度由95.18℃降低至77.85℃,同时使BCTZ陶瓷的弛豫性能降低.
      Abstract:
      Dy2O3 nanopowders with well dispersion and average particle size of 16nm were prepared by an azeotropic co-precipitation method.Ba0.85Ca0.15(Ti0.9Zr0.1)O3-Dy2O3 (BCTZ-Dy) lead-free piezoelectric ceramics doped with the as-prepared nano-Dy2O3(0.5%,1.0%) were synthesized at 1 480℃ and 1490℃ for 2 hours using solid-state sintering method.The influence of nano-Dy2O3 doping on microstructure and electrical properties of BCTZ ceramics were investigated.X-ray diffraction analysis showed that all the BCTZ ceramics still exhibited perovskite structure with the addition of nano-Dy2O3.The densities of the ceramics samples were all above 93.66%.The dielectric constant and dielectric loss of the BCTZ-Dy ceramics decreased with the increasing frequency.The Curie Temperature of BCTZ-Dy piezoceramics reduced from 95.18℃ to 77.85℃, the ceramics show typical diffuse phase transition and dielectric relaxor.The piezoelectric constant of d33 of BCTZ ceramics decreased with the addition of Dy2O3.
      Author: CHEN Zhihui LI Zhiwei DING Jianning
      作者单位: 常州大学 材料科学与工程学院,江苏 常州,213164
      年,卷(期): 2017, 29(4)
      分类号: TM28 TQ174
      在线出版日期: 2017年8月14日
      基金项目: 江苏省高校自然科学基金重大项目