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

• Published in: Journal of rare earths Vol. 29; no. 7; pp. 683 - 687
• Main Author: 丁佳钰 王哲飞 龚志态 肖瑗 王丽熙 张其土
• Format: Journal Article
• Language: English
• Published: College of Materials Science and Engineering, Nanjing University of Technology, Nanfing 210009, China%College of Materials Science and Engineering, Nanjing University of Technology, Nanfing 210009, China 01.07.2011; Jiangsu Provincial Key Laboratory of New Materials of Inorganic and Its Composites, Nanjing University of Technology, Nanjing 210009, China
• Subjects: 介电性能; 优化; 共掺杂; 微波介质材料; 微波介质陶瓷; 扫描电子显微镜; 氧化钕; 氧化铋; Bi2O3-Nd2O3-Nb2O5; Y2Ti2O7; orthogonal design; microwave dielectric ceramics; dielectric properties; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60522-4

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 system, Bi2O3, Nd2O3 and Nb2O5 were added and their effects on phase composition, micro-structure, 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/℃.