Dielectric and Energy Storage Property of (0.96NaNbO3-0.04CaZrO3)-xFe2O3 Antiferroelectric Ceramics

doi:10.15541/jim20210402

Abstract

Abstract:

0.96NaNbO₃-0.04CaZrO₃(NNCZ) ceramic shows stable double hysteresis loops at room temperature, but the property of energy density, energy storage efficiency and breakdown strength of NNCZ are terrible, which limit NNCZ to be used as energy storage materials. In this work, Fe₂O₃ was chosen to modify the energy storage property of NNCZ. (0.96NaNbO₃-0.04CaZrO₃)-xFe₂O₃(NNCZ-xFe) antiferroelectric ceramics were prepared by traditional solid reaction method. The phase, morphology, dielectric property and energy storage property of NNCZ-xFe were characterized. The results indicated that the crystal structures of NNCZ-xFe ceramics were pure perovskite structure. The sintering temperature of NNCZ ceramic was decreased with addition of Fe₂O₃. With the increase of Fe₂O₃ content, the grain size of NNCZ-xFe were decreased firstly and then raised. The NNCZ-0.02Fe ceramic obtained the smallest grain size (5.04 μm) and the best energy storage property. The breakdown strength of NNCZ-0.02Fe was 230 kV/cm at room temperature (RT). The recoverable energy density and energy storage efficiency before breakdown were 1.57 J/cm ³and 55.74% respectively. At 125 ℃ and 180 kV/cm, the energy density of NNCZ- 0.02Fe was 4.53 J/cm ³. Fe₂O₃ doping decreased the sintering temperature of NNCZ ceramics, reduced the the migration rate of oxygen vacancies and inhibited the growth of grains. At the same time, it reduced the dielectric loss and improved the breakdown strength. The oxygen vacancies pinning made antiferroelectric phase switch to ferroelectric phase harder, avoided appearance dumbbell-shaped double hysteresis loops, so the energy storage efficiency was improved. This research shows that NNCZ-xFe has a good potential application in the field of dielectric energy storage.

Key words: NaNbO₃, antiferroelectric, energy storage property, dielectric property

CLC Number:

TQ174

YE Fen, JIANG Xiangping, CHEN Yunjing, HUANG Xiaokun, ZENG Renfen, CHEN Chao, NIE Xin, CHENG Hao. Dielectric and Energy Storage Property of (0.96NaNbO₃-0.04CaZrO₃)-xFe₂O₃ Antiferroelectric Ceramics[J]. Journal of Inorganic Materials, 2022, 37(5): 499-506.

Figures/Tables 8

Fig. 1 XRD patterns of NNCZ-xFe ceramics (a), enlarged XRD patterns from 22.5° to 22.8° (b), and from 31.8° to 33.0° (c) of NNCZ-xFe ceramics

Fig. 2 Surface morphologies of NNCZ-xFe ceramics and corresponding average grain size (a) x=0; (b) x=0.02; (c) Average grain size

Fig. 3 XPS spectra of O1s peak for NNCZ-xFe (a) x=0; (b) x=0.02

Fig. 4 Temperature dependence of electrical resistivity (ρ) for NNCZ-xFe in the different temperature range

Fig. 5 Dielectric property of NNCZ-xFe ceramics (a) Temperature dependence of relative permittivity of NNCZ-xFe ceramics; (b) Loss tangent of NNCZ-xFe ceramics; (c) Change of Curie temperature (TC) and dielectric constant at room temperature (RT) with the content of Fe3+colorful figures are available on website

Fig. 6 P-E loops of NNCZ-xFe ceramics at room temperature (a) x=0; (b) x=0.005; (c) x=0.01; (d) x=0.015; (e) x=0.02; (f) x=0.025

Fig. 7 Breakdown strength and energy storage property of NNCZ-xFe ceramics (a) Breakdown strength; (b) Energy storage property before breakdown; (c, d) Energy storage property at different electric fields

Fig. 8 P-E loops and energy storage properties of NNCZ-0.02Fe ceramics at different temperatures and different frequencies (a) P-E loops of different temperatures; (b) Energy storage properties of different temperatures; (c) P-E loops of different frequencies; (b) Energy storage properties of different frequency

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Dielectric and Energy Storage Property of (0.96NaNbO₃-0.04CaZrO₃)-xFe₂O₃ Antiferroelectric Ceramics

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