(1-x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3)陶瓷的介电以及储能性能研究
收稿日期: 2024-01-23
网络出版日期: 2024-04-10
基金资助
项目受安徽高校自然科学研究项目(KJ2019A0054)
Dielectric and Energy Storage Properties of (1-x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3) Ceramics
Received date: 2024-01-23
Online published: 2024-04-10
Supported by
Natural Science Research Project of Anhui Educational Committee(KJ2019A0054)
采用常规固相法制备(1－x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3) [NN-x(BNT-BF)] (x=0.05, 0.1, 0.15, 0.2)陶瓷, 并对其物相组成、微观形貌、介电与储能特性进行系统研究. 结果表明, 随着BNT-BF含量的增加, NN-x(BNT-BF)陶瓷逐渐由正交反铁电P相和R相共存(x<0.1)转变为单一反铁电R相(x≥0.1), 弛豫行为增强. BNT-BF掺杂显著改善了陶瓷的致密度, 且陶瓷的平均晶粒尺寸随着掺杂量增大先减小后增大. 同时取代NaNbO3的A位和B位可破坏NN原有的铁电长程有序结构, 优化陶瓷的储能性能. 在410 kV/cm的击穿场强(Eb)下, NN-0.2(BNT-BF)陶瓷的有效储能密度(Wrec)和储能效率(η)分别为2.54 J/cm3和89.24%, 且在20~120 ℃的温度范围内具有高的温度稳定性. 同时, 高功率密度(PD=49 MW/cm3)、大电流密度(CD=406 A/cm2)和超快放电速度(t0.9=35 ns)使得NN-0.2(BNT-BF)陶瓷在脉冲功率系统中具有潜在的应用前景.
郭云凤 , 王俊贤 , 王泽星 , 李家茂 , 刘畅 . (1-x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3)陶瓷的介电以及储能性能研究[J]. 化学学报, 2024 , 82(5) : 511 -519 . DOI: 10.6023/A24010028
Sodium niobate (NaNbO3) ceramic, as a representative of antiferroelectric materials, has been widely studied in the field of energy storage due to its environmental friendliness and non-toxicity. However, its application is greatly limited due to its square hysteresis loop, which leads to low recoverable energy storage density (Wrec). Introducing a second component into NaNbO3 to form a solid solution can enhance its energy storage properties. According to this train of thoughts, (1－x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3) [NN-x(BNT-BF)] (x=0.05, 0.1, 0.15, 0.2) ceramics were designed through substituting the A- and B- sites of NaNbO3 with Bi3+, Fe3+, and Ti4+ simultaneously in this work. The NN-x(BNT-BF) ceramics were prepared by the conventional solid-state reaction method, and their phase compositions, microstructures, dielectric and energy storage properties were systematically investigated by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), dielectric property measurement and ferroelectric test. The results showed that with the increase of BNT-BF content, the phase composition of the NN-x(BNT-BF) ceramics gradually transformed from coexistence of orthogonal antiferroelectric P and R phases (x<0.1) to single antiferroelectric R phase (x≥0.1), and the relaxation behavior was significantly enhanced. The densification of the NN-x(BNT-BF) ceramics was remarkably improved. With the increase of BNT-BF content, the average grain size of the NN-x(BNT-BF) ceramics was firstly declined and then increased. Moreover, replacing the A- and B- sites of NaNbO3 by Bi3+, Fe3+, and Ti4+ simultaneously could disrupt its original long-range antiferroelectric ordered structure, thus optimizing energy storage performances of the ceramics. At a high breakdown field strength (Eb) of 410 kV/cm, the NN-0.2(BNT-BF) ceramic achieved Wrec of 2.54 J/cm3, and energy storage efficiency (η) of 89.24%. In addition, the NN-0.2(BNT-BF) ceramic exhibited a high temperature stability in the temperature range of 20~120 ℃. Meanwhile, large power density (PD=49 MW/cm3), high current density (CD=406 A/cm2), and ultrafast discharge rate (t0.9=35 ns) made the NN-0.2(BNT-BF) ceramic have potential applications in pulse power systems.
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