Dielectric and Energy Storage Property of BaTiO3-ZnNb2O6 Ceramics

doi:10.15541/jim20190170

Abstract

Abstract:

(1-x)BaTiO₃-xZnNb₂O₆ (x=0.5mol%, 1mol%, 1.5mol%, 2mol%, 3mol%, 4mol%) (BTZN) ceramics were synthesized by solid state method. The sintering temperature, structure, dielectric property and ferroelectric property of BTZN ceramics were systematically investigated. The sintering temperature of BTZN ceramics decreased with increasing ZnNb₂O₆ content. XRD results show that the second phase Ba₂Ti₅O₁₂ was observed when the content of ZnNb₂O₆ reached 3mol%. The dielectric measurements result showed that with increasing ZnNb₂O₆ content, the dielectric constant of BTZN ceramics decreased gradually, while the frequency stability of dielectric constant increased gradually. The temperature dependence of dielectric constant results showed that all BTZN ceramics met the characteristics of X8R capacitors. Polarization values of BTZN ceramics decreased with increasing ZnNb₂O₆ content. The dielectric breakdown strength of 240 kV/cm and a recoverable energy density of 1.22 J/cm ³ were achieved in the sample of x=4mol%.

Key words: BaTiO₃, ceramics, dielectric property, energy storage property

CLC Number:

TQ174

WANG Tong,WANG Yuanhao,YANG Haibo,GAO Shuya,WANG Fen,LU Yawen. Dielectric and Energy Storage Property of BaTiO₃-ZnNb₂O₆ Ceramics[J]. Journal of Inorganic Materials, 2020, 35(4): 431-438.

Figures/Tables 8

Fig. 1 Density as a function of sintering temperature for BTZN ceramics with inset showing the optimum sintering temperature and density of BTZN ceramics with different ZN content

Fig. 2 (a) XRD patterns of BTZN ceramics and (b) enlarged XRD patterns from 31° to 32° of BTZN ceramics

Fig. 3 SEM images of polished and thermally etched BTZN ceramics

Fig. 4 Frequency stability of dielectric properties for BTZN ceramic (a) Frequency dependence of dielectric constant (lines are linear fitting results) with inset showing the fitting values of a and b with different ZN content, and (b) frequency dependence of dielectric loss, (c) FCC, and (d) FCC as a function of ZN content

Fig. 5 Temperature dependence of dielectric constant and loss of BTZN ceramics from -100 ℃ to 500 ℃ (a)BTZN1; (b) BTZN2; (c) BTZN3; (d) BTZN4; (e) BTZN5; (f) BTZN6

Fig. 6 TCC of the BTZN ceramics at the frequency of 1 MHz and a base temperature of 25 ℃

Fig. 7 P-E loops of BTZN ceramics at critical electric field, room temperature and 10 Hz with direction of the arrow indicating the direction in which the ZN content increases with inset showing the BDS of BTZN ceramics with different ZN contents

Fig. 8 Energy storage properties of BTZN ceramics Pmax, Pr and Pmax-Pr of BTZN ceramics at 100 kV/cm; (b) Energy storage density (W); (c) Recoverable energy storage density (Wrec); (d) Energy loss density (Wloss); (e) Energy storage efficiency (η) as a function of electric field; (f) Variations of W, Wrec, Wloss and η at critical electric field with different ZN contents

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Dielectric and Energy Storage Property of BaTiO₃-ZnNb₂O₆ Ceramics

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