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Energy-Storage Study in Lead-Free Anti-Ferroelectric Bi0.5Na0.5TiO3-BaTiO3-K0.5Na0.5NbO3 Ceramics

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Abstract:

Lead-free (1-x-y)Bi0.5Na0.5TiO3-xBaTiO3-yK0.5Na0.5NbO3 (BNT-BT-KNN) ceramics were fabricated by traditional sintering method. The X-ray diffraction patterns showed that the ceramics are all crystallized into a perovskite structure phase. Measurements of temperature-dependent dielectric constants showed the two typical shoulders observed in the BNT-BT binary system, indicating that the ceramics are also of relaxor anti-ferroelectric nature. Moreover, it was observed that the dielectric constants decreased sharply with the increase of KNN addition, while maintained the same level when the BNT/BT ratio changed. The P-E hysteresis loops showed that the saturated polarization and the remnant polarization both decreased with the increasing addition of KNN, while the reduction of the BNT/BT ratio enhancesd the saturated polarization. The energy-storage density calculated from the P-E loops also increased with the decrease of KNN addition and BNT/BT ratio, which further demonstrated that the key for improving the energy density of BNT-BT-KNN ceramics is relatively low addition of KNN and low BNT/BT ratio.

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Periodical:

Materials Science Forum (Volumes 745-746)

Pages:

679-684

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.745-746.679

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Online since:

February 2013

Authors:

Feng Gao, Xian Lin Dong, Chao Liang Mao, Fei Cao, Gen Shui Wang

Keywords:

Anti-Ferroelectric, BNT-BT-KNN, Energy-Storage Density

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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