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Tailored dielectric tunability of alkali niobate-based antiferroelectric/relaxor-ferroelectric composites
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-02-18 , DOI: 10.1016/j.jeurceramsoc.2018.02.026
Zhiyong Liu , Huiqing Fan , Jinshan Lu , Yuqing Mao , Yang Zhao

High dielectric tunability, low loss and an appropriate level of dielectric permittivity are basic requirements of ferroelectric materials for tunable microwave devices. In this study, 0.96NaNbO3-0.04CaZrO3/0.88(K0.5Na0.5)NbO3-0.12SrZrO3, antiferroelectric/relaxor-ferroelectric composites were designed to tailor dielectric tunability. By tailoring the microstructure of the composites, a high dielectric tunability of 51.78% with a low loss of 0.015 was achieved at the composition ratio of 15/85. The nonlinear behaviours of the composites were explored by Johnson model; with increasing antiferroelectric phase, the contribution of the polarization to the free energy was increased between the antiferroelectric and relaxor-ferroelectric. Furthermore, the high resistance layer at the grain boundary region greatly inhibited the long-term migration of electrons and defective ions (mainly oxygen vacancies) in the composites. Therefore, the dielectric loss was remarkably decreased, and the excellent tunability was still preserved in the composite ceramics.



中文翻译:

碱性铌酸盐基反铁电/弛豫铁电复合材料的定制介电可调性

高电介质可调谐性,低损耗和适当水平的介电常数是可调谐微波设备用铁电材料的基本要求。在这项研究中,0.96NaNbO 3 -0.04CaZrO 3 /0.88(K 0.5 Na 0.5)NbO 3 -0.12SrZrO 3,反铁电/弛豫铁电复合材料的设计可调整介电可调性。通过调整复合材料的微观结构,在15/85的组成比下,可实现51.78%的高介电可调性和0.015的低损耗。利用Johnson模型探讨了复合材料的非线性行为。随着反铁电相的增加,极化对自由能的贡献在反铁电和弛豫铁电之间增加。此外,在晶界区域的高电阻层极大地抑制了复合物中电子和缺陷离子(主要是氧空位)的长期迁移。因此,介电损耗显着降低,并且在复合陶瓷中仍保留了优异的可调谐性。

更新日期:2018-02-18
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