• Journal of Inorganic Materials
  • Vol. 39, Issue 4, 423 (2024)
Ruijian SHI, Junwei LEI, Yi ZHANG, Aiwen XIE*, and Ruzhong ZUO*
Author Affiliations
  • Center for Advanced Ceramics, School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, China
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    DOI: 10.15541/jim20230486 Cite this Article
    Ruijian SHI, Junwei LEI, Yi ZHANG, Aiwen XIE, Ruzhong ZUO. Linear-like NaNbO3-based Lead-free Relaxor Antiferroelectric Ceramics with Excellent Energy-storage and Charge-discharge Properties [J]. Journal of Inorganic Materials, 2024, 39(4): 423 Copy Citation Text show less

    Abstract

    Antiferroelectric (AFE) materials exhibit great potential in the application of high-performance dielectric energy storage capacitors due to their electric field-induced AFE-ferroelectric (FE) phase transition. However, the large hysteresis of field-induced phase transition makes it difficult to simultaneously achieve high energy-storage density (Wrec) and efficiency (η) for AFEs. This work improved the energy-storage performance of NaNbO3-based lead-free AFE ceramics by introducing the third group Bi(Mg0.5Ti0.5)O3 into 0.76NaNbO3-0.24(Bi0.5Na0.5) TiO3 to regulate its relaxation characteristics. Novel lead-free AFE ceramics, (0.76-x)NaNbO3-0.24(Bi0.5Na0.5)TiO3-xBi(Mg0.5Ti0.5)O3, were prepared by a traditional solid-state reaction method. Their phase structure and microstructure as well as dielectric, energy-storage, and charge-discharge characteristics were studied. The results indicated that introduction of Bi(Mg0.5Ti0.5)O3 obviously enhanced the dielectric relaxor behavior of the matrix without changing its AFE R-phase structure, which led to the significantly reduced polarization hysteresis. Especially, a linear-like polarization-field hysteresis loop with extremely-low hysteresis was obtained in the composition of x=0.050. At the same time, microstructure of the ceramic was effectively optimized, its dielectric constant decreased, and its breakdown strength had significant enhanced. As a result, a high Wrec=3.5 J/cm3 and a high η=93% were simultaneously achieved under a moderate electric field of 30 kV/mm in the x=0.050 ceramic. Moreover, the x=0.050 ceramic also exhibited excellent charge-discharge characteristics with a high-power density PD=131(1±1%) MW/cm3, a high discharge energy density WD=1.66(1±6%) J/cm3 and a fast discharge rate t0.9<290 ns at 20 kV/mm. The charge-discharge properties maintained good stability within a wide temperature range of 25-125 ℃. These results indicate that 0.71NaNbO3-0.24(Bi0.5Na0.5)TiO3-0.050Bi(Mg0.5Ti0.5)O3 ceramics can be expected to be applied in high-power energy-storage capacitors.
    Ruijian SHI, Junwei LEI, Yi ZHANG, Aiwen XIE, Ruzhong ZUO. Linear-like NaNbO3-based Lead-free Relaxor Antiferroelectric Ceramics with Excellent Energy-storage and Charge-discharge Properties [J]. Journal of Inorganic Materials, 2024, 39(4): 423
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