铌钴共掺杂钛酸钡陶瓷的介电温度稳定性的研究

Study on dielectric-temperature stability of Nb/Co co-doped BaTiO_3 ceramics

采用X射线衍射(XRD)、拉曼光谱(RS)、原子力显微镜(AFM)以及介电温谱(DTC)研究BaTiO3-xNb2O5-0.005Co2O3(x=0.02,0.04,0.08)系统中Nb含量变化对陶瓷的结构及介电温度稳定性的影响.结果表明:增加Nb含量将增强介电陶瓷的温度稳定性,但介电常数降低.Nb含量在4%以上时NC陶瓷满足X7R介电指标.

X-ray diffraction（XRD）,Raman spectroscopy（RS）,atomic force microscope（AFM）,dielectric-temperature curve（DTC）measurements were used to study the influence of Nb content change on structure and dielectric-temperature stability in the system BaTiO3-xNb2O5-0.005Co2O3（x=0.02,0.04,0.08）.The results indicate that the increase of Nb content will increase temperature stability of dielectric ceramics,but will decrease the dielectric constant.The system meets the X7R dielectric specification when the Nb content is greater than 4%.