Novel BT-BMT-xBNT Lead-Free Ceramics with High Energy Storage Density

Abstract

Abstract: In this work, novel lead-free relaxor ferroelectric (1-x)[0.9BaTiO₃-0.1Bi(Mg_0.25Ta_0.5)O₃]-xBi_0.5Na_0.5TiO₃ceramics were synthesized via composite strategy using the traditional solid-state process. Results indicate that the incorporation of Bi_0.5Na_0.5TiO₃ with a high Curie temperature could not only significantly enhance the energy storage density, but also improve the temperature stability. As BNT concentration rose, the nano-scale polarization mismatch dominated by Bi—O coupling was established and enhanced, significantly compensating for the reduction of macroscopic polarization due to the addition of Bi(Mg_0.25Ta_0.5)O₃, leading to elevate saturation polarization and improve temperature stability. The ceramics which x is 0.2 show optimal energy storage features with a high energy storage density of 4.01 J/cm³ in the electric field of 245 kV/cm combined with a relatively high energy storage efficiency of 84.86%. Moreover, excellent temperature stabilities were noticed with the change rate of energy storage density is less than 5% and energy storage efficiency is less than 6% over a broad temperature range (20~170 ℃).

Key words: lead free, relaxor ferroelectric, energy storage, BaTiO₃ based ceramics, energy storage efficiency, temperature stability

CLC Number:

TQ174

LEI Lei, WU Jian, DONG Zihan, LU Lin, LI Xu, WANG Liang, WAN Hao. Novel BT-BMT-xBNT Lead-Free Ceramics with High Energy Storage Density[J]. Journal of Synthetic Crystals, 2022, 51(11): 1967-1972.

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