Enhanced energy-storage performance with excellent stability under low electric fields in BNT-ST relaxor ferroelectric ceramics

Relaxor ferroelectrics are promising candidates for pulsed power dielectric capacitor applications because of their excellent energy-storage properties. Different from most relaxor ferroelectrics whose energy-storage density was improved by increasing the breakdown strength and reducing the remanent...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2019, Vol.7 (2), p.281-288
Main Authors: Ma, Weigang, Zhu, Yiwei, Marwat, Mohsin Ali, Fan, Pengyuan, Xie, Bing, Salamon, David, Ye, Zuo-Guang, Zhang, Haibo
Format: Article
Language:English
Subjects:
Antiferroelectricity
Capacitors
Ceramics
Density
Dielectric properties
Dielectric relaxation
Electric fields
Energy
Energy storage
Ferroelectric materials
Ferroelectrics
Free energy
High temperature
Lead free
Polarization
Relaxors
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Summary:Relaxor ferroelectrics are promising candidates for pulsed power dielectric capacitor applications because of their excellent energy-storage properties. Different from most relaxor ferroelectrics whose energy-storage density was improved by increasing the breakdown strength and reducing the remanent polarization, in this study, anti-ferroelectric (AFE) AgNbO 3 (AN) was used to partially substitute the relaxor ferroelectric 0.76Bi 0.5 Na 0.5 TiO 3 -0.24SrTiO 3 (BNT-ST) of morphotropic phase boundary (MPB) composition to reduce the remanent polarization while maintaining large maximum polarization. In this way, a large recoverable energy-storage density (2.03 J cm −3 ) was obtained in the BNT-ST-5AN ceramics under lower electric field of 120 kV cm −1 , which is superior to other lead-free energy-storage materials under similar electric fields. Moreover, excellent temperature (25-175 °C) and frequency (1-100 Hz) stabilities are achieved. This performance demonstrates that the BNT-ST-5AN ceramics form a promising class of dielectric capacitive material for high-temperature pulsed power capacitors with large energy-storage density. Relaxor ferroelectrics are promising candidates for pulsed power dielectric capacitor applications because of their excellent energy-storage properties.
ISSN:2050-7526
2050-7534
DOI:10.1039/c8tc04447c