新型BT-BMT-xBNT无铅高储能密度陶瓷研究

本文采用传统固相反应法, 成功制备了新型无铅弛豫铁电陶瓷(1-x)［0.9BaTiO3-0.1Bi(Mg0.25Ta0.5)O3］-xBi0.5Na0.5TiO3。结果表明, 较高居里温度的Bi0.5Na0.5TiO3的引入, 使得材料体系中建立了更多的以Bi-O耦合为主的极性纳米区域, 弥补了因Bi(Mg0.25Ta0.5)O3的加入导致的宏观极化强度的减少, 提高了材料的饱和极化强度, 实现了较高储能密度的同时具有更好的温度稳定性。在245 kV/cm电场强度下, x=0.2样品的储能密度约为4.01 J/cm3, 储能效率约为84.86%, 同时该组分在20~170 ℃储能密度的变化率小于5%, 储能效率的变化率小于6%, 表现出优异的温度稳定性。

Abstract

In this work, novel lead-free relaxor ferroelectric (1-x)［0.9BaTiO3-0.1Bi(Mg0.25Ta0.5)O3］-xBi0.5Na0.5TiO3ceramics were synthesized via composite strategy using the traditional solid-state process. Results indicate that the incorporation of Bi0.5Na0.5TiO3 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(Mg0.25Ta0.5)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 ℃).

参考文献

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雷磊, 吴健, 董子晗, 卢林, 李旭, 王良, 万昊. 新型BT-BMT-xBNT无铅高储能密度陶瓷研究[J]. 人工晶体学报, 2022, 51(11): 1967. 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.

新型BT-BMT-xBNT无铅高储能密度陶瓷研究

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