Grain size tailoring and enhanced energy storage properties of two-step sintered Nd3+-doped AgNbO3
Grain size tailoring and enhanced energy storage properties of two-step sintered Nd3+-doped AgNbO3
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DOI：
10.1016/j.jeurceramsoc.2020.05.076
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发表时间：
2020-10
影响因子：
5.7
通讯作者：
Pengrong Ren;Dong Ren;Liang Sun;Fuxue Yan;Shu Yang;Gaoyang Zhao
中科院分区：
文献类型：
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作者：
Pengrong Ren;Dong Ren;Liang Sun;Fuxue Yan;Shu Yang;Gaoyang Zhao
AgNbO 3作为一种无铅反铁电材料，在储能器件方面具有广阔的应用前景，近年来受到广泛关注。然而，高剩余极化和低击穿强度限制了其储能性能。在这项工作中，Nd 3+掺杂的AgNbO 3（Ag 1 - 3xNdxNbO 3，x=0 - 0.015）陶瓷的制备和两步烧结法。Nd ~（3+）的引入增强了反铁电相的稳定性，细化了晶粒，提高了电阻率。此外，通过调整两步烧结过程中的预热温度，改善了烧结体的微观组织均匀性，使烧结体的电阻比正常烧结体提高了一个数量级，从而提高了击穿强度。Ag 0. 97 Nd 0. 01 NbO 3在1100 °C下预热2 h后具有良好的储能性能，在210 kV/cm电场下可恢复储能密度为3. 2 J/cm 3，能量效率为52%。
AgNbO3as a lead-free antiferroelectric material, has received widespread attention in recent years due to its promising application in the aspects of energy storage devices. However, the high remnant polarization and low breakdown strength limits its energy storage properties. In this work, Nd3+-doped AgNbO3(Ag1−3xNdxNbO3, x=0−0.015) ceramics were prepared and a two-step sintering method was employed. The introduction of Nd3+leads to the enhanced stability of the antiferroelectric phase, refined grain size and increased resistivity. Furthermore, by adjusting the pre-heating temperature in the two-step sintering, the homogeneity of microstructure is improved and the resistance of pre-heated samples increases by one order of magnitude compared with normally sintered samples, leading to the enhanced breakdown strength. Ag0.97Nd0.01NbO3pre-heated at 1100 °C for 2 h exhibits promising energy storage properties, with a recoverable energy storage density of 3.2 J/cm3and energy efficiency of 52 % under an applied electric field of 210 kV/cm.