Realizing high low-electric-field energy storage performance in AgNbO3 ceramics by introducing relaxor behaviour

Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density (Wrec) at low applied electric field. In this work, a remarkably high Wrec of 2.9 J/cm3 accompanying with energy storage efficiency of 56% w...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of Materiomics 2019-12, Vol.5 (4), p.597-605
Hauptverfasser: Han, Kai, Luo, Nengneng, Mao, Shuaifei, Zhuo, Fangping, Chen, Xiyong, Liu, Laijun, Hu, Changzheng, Zhou, Huanfu, Wang, Xinpeng, Wei, Yuezhou
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density (Wrec) at low applied electric field. In this work, a remarkably high Wrec of 2.9 J/cm3 accompanying with energy storage efficiency of 56% was achieved in Ag0.9Sr0.05NbO3 ceramic at a low applied electric field of 190 kV/cm, by improving anti-ferroelectricity and introducing relaxor behaviour. The improved anti-ferroelectric stability was attributed to the decreased tolerance factor and average electronegativity difference, while the relaxor behaviour was associated with the increased disordered local structure by Sr-doping. Moreover, the Ag0.9Sr0.05NbO3 ceramics also exhibited outstanding temperature stability in energy density with small variation less than 5% over 20–140 °C. The results indicate that the Ag0.9Sr0.05NbO3 ceramic is a promising candidate for low-electric-field driving capacitors. Keywords: Low applied electric field, Energy storage, Relaxor behaviour, Silver niobate, Anti-ferroelectric
ISSN:2352-8478
DOI:10.1016/j.jmat.2019.07.006