TY - JOUR
T1 - Microstructure and dielectric characteristics of Nb2O5 doped BaTiO3-Bi(Znl/2Til/2)O3 ceramics for capacitor applications
AU - Lu, Yangyang
AU - Hao, Hua
AU - Zhang, Shujun
AU - Liu, Hanxing
AU - Su, Cong
AU - Yao, Zhonghua
AU - Cao, Minghe
N1 - Funding Information:
This work was supported by Natural Science Foundation of China (no. 51372191 ), the National Key Basic Research Program of China (973 Program) (no. 2015CB654601 ) and International Science and Technology Cooperation Program of China ( 2011DFA52680 ). The author S. Zhang thanks Australian Research Council for support through Future Fellowships scheme ( FT140100698 ).
PY - 2017/1/1
Y1 - 2017/1/1
N2 - The effects of Nb2O5 addition on the dielectric properties and phase formation of 0.8BaTiO3-0.2Bi(Znl/2Til/2)O3 (0.8BT-0.2BZT) ceramics were investigated. The desired perovskite phase was achieved with Nb2O5 doping levels being in the range of 0.5 wt.%–3.0 wt.%. The 0.8BT-0.2BZT ceramics doped with 1.5 wt.% Nb2O5 was found to possess a moderate dielectric constant (ε = 1170) and low dielectric loss (tanδ = 1%) at room temperature and 1 kHz frequency, showing a flat dielectric behavior over the temperature range of −55 °C–200 °C. Based on this composition, the X9R-MLCC (multilayer ceramic capacitor) with Ag0.7-Pd0.3 electrode was sintered at 1060 °C. The optimized capacitance of the MLCC is 26.5 nF, with dielectric loss tanδ of 0.9% and electrical resistance of 4.50 × 1011 Ω at room temperature, leading to a high time constant of 11,900 s, decreasing to 175 s at 200 °C, being one order higher than those of commercial X7R MLCC. In addition, the equivalent series resistance (ESR) was found to be on the order of 0.2 mΩ at 2 MHz, much lower than that of the DC Bus Capacitor Bank for the automotive inverters (where the desired characteristic is <3 mΩ). All these characteristics of the newly developed MLCC will benefit the high temperature and high power capacitor applications.
AB - The effects of Nb2O5 addition on the dielectric properties and phase formation of 0.8BaTiO3-0.2Bi(Znl/2Til/2)O3 (0.8BT-0.2BZT) ceramics were investigated. The desired perovskite phase was achieved with Nb2O5 doping levels being in the range of 0.5 wt.%–3.0 wt.%. The 0.8BT-0.2BZT ceramics doped with 1.5 wt.% Nb2O5 was found to possess a moderate dielectric constant (ε = 1170) and low dielectric loss (tanδ = 1%) at room temperature and 1 kHz frequency, showing a flat dielectric behavior over the temperature range of −55 °C–200 °C. Based on this composition, the X9R-MLCC (multilayer ceramic capacitor) with Ag0.7-Pd0.3 electrode was sintered at 1060 °C. The optimized capacitance of the MLCC is 26.5 nF, with dielectric loss tanδ of 0.9% and electrical resistance of 4.50 × 1011 Ω at room temperature, leading to a high time constant of 11,900 s, decreasing to 175 s at 200 °C, being one order higher than those of commercial X7R MLCC. In addition, the equivalent series resistance (ESR) was found to be on the order of 0.2 mΩ at 2 MHz, much lower than that of the DC Bus Capacitor Bank for the automotive inverters (where the desired characteristic is <3 mΩ). All these characteristics of the newly developed MLCC will benefit the high temperature and high power capacitor applications.
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U2 - 10.1016/j.jeurceramsoc.2016.08.003
DO - 10.1016/j.jeurceramsoc.2016.08.003
M3 - Article
AN - SCOPUS:84991239103
VL - 37
SP - 123
EP - 128
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 1
ER -