Enhanced energy storage properties of silver niobate ceramics under hydrostatic pressure

• Published in: Materials letters 2019-07, Vol.247, p.40-43
• Main Authors: Ma, Jianglei, Yan, Shiguang, Xu, Chenhong, Cheng, Guofeng, Mao, Chaoliang, Bian, Jianjiang, Wang, Genshui
• Format: Article
• Language: English
• Subjects: AgNbO3; Antiferroelectric; Antiferroelectricity; Ceramics; Efficiency; Electric fields; Energy; Energy storage; Energy storage and conversion; Hydrostatic pressure; Lead free; Materials science; Niobates; Switching
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2019.03.035

•a way of external pressure to enhance energy storage properties of AgNbO3 ceramics.•An η of 56% and Wrec of 1.3 J/cm3 has been achieved in AgNbO3 ceramics under 400 MPa.•Hydrostatic pressure results in an enhancement in η and Wrec by 47% and 23%, respectively. Despite its low energy storage efficiency (∼46%), silver niobate (AgNbO3) is considered as a promising lead-free antiferroelectric material due to its environmental advantages. Herein, we demonstrate that the energy storage efficiency of AgNbO3 ceramics can be enhanced by applying hydrostatic pressure. The results reveal that the hydrostatic pressure contributed to the decline of remanent polarization (Pr) and the switching hysteresis ΔE. In addition, the externally applied pressure improved the reverse switching field (EA). This indicates an enhanced antiferroelectricity, benefiting the enhancement of energy storage properties of AgNbO3 ceramics. Under the pressure of 400 MPa, the as-prepared AgNbO3 ceramics exhibited an energy storage efficiency (η) of 56% and a recoverable energy storage density (Wrec) of 1.3 J/cm3 under the electric field of 13 kV/mm, corresponding to an enhancement of 47% and 30%, respectively.