Influence of A-site Sm Doping on Structural and Electrical Property of 0.93Na0.5Bi0.5TiO3-0.07BaTiO3 Lead Free Ceramics

doi:10.15541/jim20170343

Abstract

Abstract:

Sm doped [(Na_0.5Bi_0.5)_0.93Ba_0.07]_1-_xSm_xTiO₃ (BNBST) lead-free dielectric energy storage ceramics were prepared by solid-phase reaction sintering method. Effects of the Sm doping content on phase structure, microstructure, ferroelectric, dielectric, energy storage properties and d.c., and a.c. conductance of BNBST ceramics were systematically investigated. Results indicate that the as-fabricated BNBST ceramics exhibit single-phase perovskite structure, and Sm dopants get into the A-site lattice of (Na_0.5Bi_0.5)_0.93Ba_0.07TiO₃ matrix. Dense and uniform grains are obtained by grain growth inhibition of Sm dopants with average grain size within 2 μm. The remanent polarization and coercivity of BNBST ceramics sharply decrease after introducing Sm dopants, and the double hysteresis loops are observed with a little decrease of saturation polarization. The energy storage density and efficiency increase firstly and then decrease with increasing Sm doping content, the energy storage density reaches a maximum value of 0.70 J/cm³ at x=0.02 and 70 kV/cm electric field, with corresponding efficiency of 40%. The BNBST ceramics show an obvious relaxation ferroelectric characteristic and its dielectric constant peaks of T_m decrease and planarize with increasing Sm doping content. The electric insulativity of BNBST ceramics has strong temperature dependence, and the excellent electric insulativity can be kept when ambient temperature is below 300℃.

Key words: BNT-BT, Sm doping, energy storage, ferroelectric

CLC Number:

TQ174

DOU Run-Pu, LU Xiao-Peng, YANG Ling, WANG Hua, ZHOU Chang-Rong, XU Ji-Wen. Influence of A-site Sm Doping on Structural and Electrical Property of 0.93Na_0.5Bi_0.5TiO₃-0.07BaTiO₃ Lead Free Ceramics[J]. Journal of Inorganic Materials, 2018, 33(5): 528-534.

Figures/Tables 10

Fig. 1 XRD patterns ranging from (a) 20°-80° and (b) 46°- 47° of BNBST ceramics doped with different amounts of Sm

Fig. 2 Surface morphologies of BNBST ceramics doped with different amounts of Sm(a) x=0.01; (b) x=0.02; (c) x=0.03; (d) x=0.04

Fig. 3 Average grain size of BNBST ceramics doped with different amounts of Sm

Fig. 4 Hysteresis loops of BNBST ceramics doped with different amounts of Sm

Fig. 5 Energy storage density and efficiency of BNBST ceramics doped with different amounts of Sm

Fig. 6 Hysteresis loops of BNBST ceramic (x=0.02) tested at different external electric fields

Fig. 7 Temperature dependence of dielectric constant and loss of BNBST ceramics doped with different amounts of Sm at 1 kHz、10 kHz and 100 kHz(a) x=0.01; (b) x=0.02; (c) x=0.03; (d) x=0.04

Fig. 8 Plots of ln(1/ε-1/εm) versus ln(T-Tm) of BNBST ceramics doped with different amounts of Sm

Fig. 9 Resistance of BNBST as a function of frequency, and with inset showing lgI-lgU curve tested by direct current mode

Fig. 10 Cole-Cole plots of BNBST ceramic (x=0.02) measured from 100℃ to 550℃

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Influence of A-site Sm Doping on Structural and Electrical Property of 0.93Na_0.5Bi_0.5TiO₃-0.07BaTiO₃ Lead Free Ceramics

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