KTaNbO极性对KTN/PVDF纳米复合材料介电性能的影响。
Effect of the polarity of KTa Nb O on the dielectric performance of the KTN/PVDF nanocomposites.
作者信息
Lin Jiaqi, Li Yang, Liu Xinmei, Li Yuanshuo, Zheng Weijie, Yang Wenlong
机构信息
Department of Applied Science, Harbin University of Science and Technology Harbin 150080 P. R. China
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology Harbin 150080 P. R. China.
出版信息
RSC Adv. 2020 Jul 13;10(44):26256-26261. doi: 10.1039/d0ra03859h. eCollection 2020 Jul 9.
KTa Nb O with different Ta/Nb ratios ( = 0.15, 0.25, 0.5, 0.75, 0.85) were engineered and prepared by a facile hydrothermal synthesis method to acquire KTN nanoparticles with varied polarity. To investigate the effect of KTN filler with varied polarity on the dielectric performance of polymer matrix composites, KTN/PVDF films were fabricated. The experiment demonstrated the polarity of KTN affected the dielectric performance of the composites. KTaNbO possesses larger polarity with permittivity of 3780 at 1 kHz due to its Curie temperature is closer to room temperature, which contributes 30 wt% doped KTaNbO/PVDF composite achieving higher permittivity of 19.5 at 1 kHz than those of the others. Additionally, KTaNbO/PVDF composite presents higher breakdown strength than those of the others with an value of 164 kV mm when 20 wt% filler is doped. The significant improved dielectric performance by Ta/Nb ratio engineering has the potential of providing new insight on enhancing the energy storage in ceramic-polymer nanocomposites.
通过简便的水热合成方法制备了具有不同Ta/Nb比（= 0.15、0.25、0.5、0.75、0.85）的KTaNbO，以获得具有不同极性的KTN纳米颗粒。为了研究具有不同极性的KTN填料对聚合物基复合材料介电性能的影响，制备了KTN/PVDF薄膜。实验表明，KTN的极性影响了复合材料的介电性能。由于其居里温度更接近室温，KTaNbO具有较大的极性，在1 kHz时介电常数为3780，这使得30 wt%掺杂KTaNbO/PVDF复合材料在1 kHz时的介电常数比其他复合材料更高，达到19.5。此外，当掺杂20 wt%填料时，KTaNbO/PVDF复合材料的击穿强度比其他复合材料更高，值为164 kV/mm。通过Ta/Nb比工程显著改善的介电性能有可能为增强陶瓷-聚合物纳米复合材料的储能提供新的见解。
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