摘要
采用单因素变量法研究了(B a,S r)T iO3基电容器陶瓷中掺杂稀土氧化物D y2O3对材料介电性能的影响,得到了D y2O3影响其性能的规律,即随着D y2O3加入量的增加材料的介电常数开始增大随后减少,当W(D y2O3)=0.5%时介电常数最大,而介质损耗逐渐减少。得到了介电常数为5245,介质损耗为0.0026,耐压为5.5kV/mm的高压低损耗陶瓷电容器瓷料。利用SEM分析了不同D y2O3加入量样品的表面形貌。结果表明:D y2O3有强烈的偏析晶界、抑制晶粒生长和细晶、形成固溶体等来影响BST性能。这些结果为D y2O3掺杂改性(B a,S r)T iO3基电容器陶瓷提供依据。
The influence ofDy2O3 doping on the dielectric properties of （Ba, Sr）TiO3 series capacitor ceramics has been studied by means of single factor variable method, and the law of the influence on the BST series capacitor ceramics has been obtained, i.e. with the increasing of Dy2O3 additive amount, the dielectric constant （ε） of materials starts increasing and then decreasing while the dielectric loss （tanδ） decreasing and the dielectric constant （ε） is maximum while W（Dy2O3）=0.5%. The BST ceramics with optimum comprehensive properties have been obtained, having high ε （=5245）, low tan δ （=0. 0026） and high DC breakdown voltage （=5.5kV/mm）. The influence of Dy2O3 additive amount on the SEM photograph of the surface microstructure of BST ceramics has been studied by means of SEM. The results show that Dy2O3 additives influence the properties and microstructure of BST ceramics by means of forming defect solid solution, strong segregation in crystal boundary, stopping grain growth, fine crystal grain, and so on. These results provide the basis for Dy2O3-doped （Ba, Sr） TiO3 series capacitor ceramics.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第11期1127-1129,1190,共4页
Chinese Journal of Scientific Instrument
关键词
陶瓷电容器
钛酸钡锶
三氧化二镝
陶瓷
稀土
Ceramic capacitor Barium and strontium titanate Dy2O3 Ceramics Rare-earth
