Boosting dielectric temperature stability in BNBST‐based energy storage ceramics by Nb2O5 modification

Exploring environment‐friendly energy storage ceramics simultaneously featuring large recoverable energy storage density (Wrec), high‐energy storage efficiency (ƞ), and excellent temperature stability is highly desirable for the application of pulsed power systems. Herein, Nb2O5 was introduced to mo...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2023-06, Vol.106 (6), p.3633-3642
Main Authors: Zhu, Wen, Guo, Huanhuan, Shen, Zong‐Yang, Song, Fusheng, Luo, Wenqin, Wang, Zhumei, Li, Yueming
Format: Article
Language:English
Subjects:
BNT
BST
Ceramics
Driving conditions
Electric fields
Energy storage
energy storage ceramics
Ferroelectricity
High temperature
Low voltage
Nb2O5
Niobium oxides
relaxor ferroelectrics
Solid phases
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Summary:Exploring environment‐friendly energy storage ceramics simultaneously featuring large recoverable energy storage density (Wrec), high‐energy storage efficiency (ƞ), and excellent temperature stability is highly desirable for the application of pulsed power systems. Herein, Nb2O5 was introduced to modify BNBST‐based lead‐free relaxor ferroelectric ceramics in an effort to enhance the dielectric temperature stability. (Bi0.5Na0.5)0.65(Ba0.3Sr0.7)0.35(Ti0.98Ce0.02)O3 (BNBSTC) + x wt%Nb2O5 (0 ≤ x ≤ 4) ceramics were prepared by a solid‐state reaction method. The phase structure, microstructure, dielectric, and energy storage properties of the ceramics have been systematically studied. It was found that the εr–T curve was flattened, and the dielectric temperature stability was effectively improved due to the addition of Nb2O5. A noticeable Wrec (1.44 J/cm3) with high η (84.1%) was obtained in BNBSTC + 2 wt%Nb2O5 ceramics at a low electric field of 90 kV/cm, which was mainly due to a refined P–E loop induced by Nb2O5. In addition to excellent frequency and anti‐fatigue cycle stability, this ceramic provides a new solution for designing pulsed power capacitors with high energy density and high temperature stability under low voltage driving conditions.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.19050