摘要
采用传统固相法制备Dy2O3掺杂(Ba0.7Sr0.3)TiO3系电容器介质陶瓷,通过扫描电镜、X线衍射仪及LCR测试系统,研究不同含量的Dy2O3对体系微观结构及介电性能的影响。结果表明,随着Dy2O3添加量的增大,(Ba0.7Sr0.3)TiO3陶瓷平均粒径减小且Dy2O3掺杂(Ba0.7Sr0.3)TiO3陶瓷均为钙钛矿结构单相固溶体。Dy2O3通过占据钙钛矿晶格A、B位引起(Ba0.7Sr0.3)TiO3陶瓷晶格畸变,体系自发极化能力降低,进而显著降低了体系室温相对介电常数及介电损耗。随着Dy2O3添加量的增大,(Ba0.7Sr0.3)TiO3陶瓷居里温度向负温方向移动,且体系的相对介电常数及介电损耗随温度变化显著。
The Dy2O3-doped （Bao. 7 Sro. 3 ） TiO3 ceramics for capacitor applications were prepared by the conventional solid state method. The effects of different content of Dy2 O3 on the microstructure and dielectric properties of （Ba0.7Sr0.3） TiO3 were investigated by the scanning electron microscope, X-ray diffractometer and LCR measure system. It has been found that the average grain size of （Ba0.7 Sr0.3 ） TiO3 ceramics decreases with the increase of Dy2 O3 addition content and Dy2 O3-doped （Ba0. 7 Sr0. 3 ） TiO3 ceramics are single-phase solid solution with perovskite structure. Dy2 O3 can significantly reduce the relative dielectric constant and dielectric loss by occupying the A site or B site in perovskite structure, causing the unit cell distortion and thus resulting in the weakening of spontaneous polarization. With the increase of Dy2 O3 addition content, the Curie temperature of （Ba0.7 Sr0.3）TiO3 ceramics shifts to lower temperautre range. The relative dielectric constant and dielectric loss of Dy2 O3-doped （Ba0.7 Sr0.3 ） TiO3 system are significantly influenced by temperature.
出处
《压电与声光》
CSCD
北大核心
2012年第6期898-901,904,共5页
Piezoelectrics & Acoustooptics
基金
江苏省高校自然科学基金资助项目(11KJB430007)
关键词
钙钛矿
陶瓷
介电性能
微观结构
perovskite
ceramics
dielectric properties
microstructure
