摘要
研究了Nb2O5/Co2O3加入量[质量分数,Nb/Co(摩尔比)=0.8]不同对(Ba,Sr)TiO3(Barium strontiumtitanate,BST)铁电电容器陶瓷介电性能的影响,得到不同Nb2O5/Co2O3加入量与BST陶瓷性能的关系。借助扫描电镜(SEM)和X射线衍射仪(XRD)研究不同Nb2O5/Co2O3加入量对BST陶瓷显微结构和物相的影响,探讨了Nb2O5/Co2O3加入量对BST陶瓷性能影响机理。结果表明:当Nb2O5/Co2O3加入量为1.0%时,可得到满足Y5V特性、介电常数为3934、介质损耗为2.6%综合性能好的BST陶瓷。Nb2O5/Co2O3加入量对BST陶瓷性能的影响是通过细晶化、压抑展宽居里峰、改善介电常数温度特性、减少介电常数、形成杂相、形成“晶核-晶壳”结构等进行。
The effects of various Nb2O5/Co2O3 additive amount （mass fraction , Nb/Co mole ratio is equal to 0. 8 ） on the dielectric properties of （ Ba, Sr） TiO3 （ Barium Strontium Titanate, BST） ferroelectric capacitor ceramics were investigated. The influence of various Nb2O5/Co2O3 additive amount on microstructure and structural phase of BST ceramics were studied by scanning electron microscope （SEM） and X-ray diffraction （XRD）. The relationship between different Nb2O5/Co2O3 additive amount and the properties of BST ceramics was obtained and the mechanism was discussed. The results show that the BST ceramics having optimum comprehensive properties has been obtained , which the dielectric temperature property is suited for YSV character, the dielectric constant is 3934 and the dielectric loss is 2.6% ,while Nb2O5/Co2O3 additive amount is 1.0% （mass fration）. The effects of Nb2O5/Co2O3 additive amount on the properties of BST ceramics are conducted by means of fining grain, repressing and broadening Curie peak, improving temperature character of dielectric constant, decreasing dielectric constant, forming impurity phase and coming into being＂ Core - shell＂ structure.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2006年第3期623-626,634,共5页
Journal of Synthetic Crystals
关键词
氧化铌
氧化钴
电容器陶瓷
钛酸钡锶
陶瓷
niobium oxide
cobalt oxide
capacitor ceramics
barium strontium titanate
ceramics
