In-situ Transmittance Measurement of Polarization and Dielectric Relaxation Behaviors of LiNbO3 Ferroelectric Nanocrystal in Polycarbonate Matrix

Haifa Zhai, Zhiyong Liu, Haiqin Li, Hongjing Li, Hongying Luo, Jien Yang, Hairui Liu

Abstract


LiNbO3/polycarbonate (LNO/PC) composite films with different concentration of LiNbO3 ferroelectric nanocrystals are prepared by spin coating method. The polarization and dielectric relaxation behaviors of LNO/PC composite films are characterized through in-situ transmission spectrum measurement. The LiNbO3 ferroelectric nanocrystals are prepared by hydrothermal method with rhombohedral structure and the average crystal size is about 50 nm. It’s found that 15%LNO/PC composite film has the largest orientation change with the ϕ value of 62% and slow dielectric relaxation, almost no decay after 6 h. Based on the literatures, we can proposed that the preferential orientation of LiNbO3 nanocrystals after poling is [001] direction. This suggests that in-situ transmittance measurement is a simple and effect way to evaluate the polarization and dielectric relaxation behaviors of ferroelectric nanocrystals/polymer systems.


DOI
10.12783/dtetr/apetc2017/11097

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