ZHU Wen, MENG Yue, SONG Fusheng, LI Zhipeng, SHEN Zongyang
(Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province, China National Light Industry Key Laboratory of Functional Ceramic Materials, Advanced Ceramic Materials Research Institute, School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)
Abstract: (Bi0.5Na0.5)0.65(Ba0.3Sr0.7)0.35Ti1−xYxO3(BNBSTY100x, x=0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were prepared by using solid state reaction method. The effect of Y3+ on phase composition, microstructure, dielectric properties and energy storage characteristics of the BNBST ceramics was systematically studied. The ceramics exhibited a single pseudocubic perovskite structure when the concentration of Y3+ is x ≤ 0.04, while a secondary phase Y2Ti2O7 can be detected for x ≥ 0.06. The doping with Y3+ led to ceramics with smaller grain size, but increased density and uniformity. With increasing content of Y3+ , dielectric peak of the ceramics was gradually suppressed and broadened, which effectively increased the dielectric temperature stability, while the dielectric impedance at high temperature was enhanced. At the same time, the P-E hysteresis loops became slim. Specifically, the BNBSTY6 sample exhibited Wrec = 1.27·cm−3 and η = 89% at a low electric field of 100 kV·cm−1, with promising
temperature and frequency stability and fatigue cycle characteristics, which is suitable for ceramic capacitor applications.
Key words: energy storage ceramics; relaxor ferroelectric; rare earth doping; BNT; BST