Optimization on dielectric properties of Y2Ti2O7 ceramics with Bi2O3-Nd2O3-Nb2O5 co-doping

• 作 者: DING Jiayu WANG Zhefei GONG Zh
• 出 处: 稀土学报（英文版）
• 发表日期: 2004年期
• 关键词: microwave dielectric ceramics Y2Ti2O7 dielectric properties Bi2O3-Nd2O3-Nb2O5 or

The present work aimed to explore a kind of microwave dielectric materials with middle-permittivity,high Qf,near-zero τf,and lower sintering temperature.A series of Y2Ti2O7 microwave dielectric ceramics were synthesized by conventional solid-state method.For improving the dielectric properties of Y2Ti2O7 systerm,Bi2O3,Nd2O3 and Nb2O5 were added and their effects on phase composition,microstructure,and dielectric properties at microwave frequencies were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM).The queuing score method for multi-target orthogonal design was used to obtain the optimum prescription.The results showed that the Y2Ti2O7 ceramics with 8 wt.％ Bi2O3 and 1 mol.％ Nd2O3-Nb2O5 were well sintered at 1350 ℃,exhibiting excellent dielectric characteristics,i.e.εr≈76,Qf≈18980 GHz,τf=+25.5 ppm/℃.