Diffuse dielectric behaviors in non-stoichiometric sodium niobate-based ceramics via Bi-substitution
Diffuse dielectric behaviors in non-stoichiometric sodium niobate-based ceramics via Bi-substitution
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DOI：
10.1016/j.ceramint.2022.07.212
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
Jiayi He;Xiao Liu;Min Li;Zhiyun Zhang;Li Zhang;Tao Zhang;H. Du;Jing Shi
中科院分区：
文献类型：
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作者：
Jiayi He;Xiao Liu;Min Li;Zhiyun Zhang;Li Zhang;Tao Zhang;H. Du;Jing Shi
系统研究了Bi取代非化学计量比Na_2O_3基反铁电陶瓷的相变、介电行为和铁电性能。掺杂Bi 3+能够调节相变温度，同时促进极性纳米区的形成，而不是长程有序结构的形成。通过Rietveld结构精修确定了随着Bi 3+掺杂量的增加，从正交P相到由P相和正交R相组成的伪立方相的相变。成分调节使介电异常向低温移动，有效地增强了弛豫性质。具体来说，与氧空位缺陷引起的扩散介电弛豫相关，在-82 °C至408 ° C的宽温度范围内实现了优异的热稳定性。此外，在中等电场下，可回收的能量密度和效率同时得到显著提高。这一工作使其成为高温电容器应用的替代AFE策略。
Systematic investigation on the phase transition, dielectric behavior, and ferroelectric property of non-stoichiometric sodium niobate-based antiferroelectric (AFE) ceramics is carried out via Bi-substitution. Doping Bi3+is capable of adjusting phase transition temperature meanwhile accelerating the formation of polar nanoregions instead of the long-range order structure. The phase transition is identified by the structural Rietveld refinement from the orthorhombic P phase to the pseudo-cubic phase consisting of the P and orthorhombic R phase as Bi3+dopant increases. The composition regulation shifts the dielectric anomaly to a lower temperature and effectively enhances the relaxor nature. Specifically, associated with the diffuse dielectric relaxation aroused by oxygen vacancy defect, excellent thermal stability is achieved in a wide temperature range from −82 °C to 408 °C. Additionally, the simultaneously significant improvement of the recoverable energy density and efficiency is gained at moderate electric fields. This work makes it an alternative AFE strategy for the application of high-temperature capacitor.