Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 36, Pages 8380-8384Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc03289c
Keywords
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Funding
- National Natural Science Foundation of China [51332002]
- Ministry of Science and Technology of China [2015CB654605]
- ARC [FT140100698]
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Dielectric ceramic materials have been actively studied for advanced pulsed power capacitor applications. Despite the good properties obtained in lead-based ceramics, lead-free counterparts are highly desired due to environmental regulations. This study revealed the potential of AgNbO3 to be a promising lead-free ceramic for energy storage applications. AgNbO3 ceramics fabricated using a conventional solid-state reaction method under an O-2 atmosphere show a characteristic anti-ferroelectric (AFE) double hysteresis loop at an electric field of 4130 kV cm(-1), with a peak recoverable energy storage density (W-rec) of 1.6 J cm(-3) at 140 kV cm(-1). In addition, the incorporation of MnO2 into AgNbO3 can further increaseWrec, exceeding 2.3 J cm(-3) at 150 kV cm(-1) by the reduction of the remnant polarization, which is due to the enhanced AFE stability induced by the addition of MnO2. Of particular importance is that the 0.1 wt% MnO2-doped AgNbO3 ceramics were found to possess a good thermal stability with Wrec = 2.5-2.9 J cm(-3) over a temperature range of 20-180 8C at 150 kV cm(-1) and 1 Hz.
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