Monitoring polarization and dielectric relaxation behaviors of BaTiO3/PC composite films via transmittance measurement
| Autor: | Haifa Zhai, Jian Su, Haiqin Li, Jinfeng Wang, Tiantian Zhang, Jien Yang, Hairui Liu, Liuyang Zheng, Hongying Luo |
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| Rok vydání: | 2016 |
| Předmět: |
Preferential alignment
Spin coating Materials science Condensed matter physics business.industry Poling Composite number General Physics and Astronomy 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Ferroelectricity 0104 chemical sciences Optics Transmittance General Materials Science 0210 nano-technology business |
| Zdroj: | Current Applied Physics. 16:686-690 |
| ISSN: | 1567-1739 |
| Popis: | BaTiO 3 /polycarbonate (BT/PC) composite films with different concentration of BaTiO 3 ferroelectric nanocrystals are prepared by a spin coating method. The polarization and dielectric relaxation behaviors of BT/PC composite films are characterized by the introduction of orientational order parameter ( ϕ ) through in-situ transmission spectrum measurement. It's found that 15%BT/PC composite film has the largest orientation change with the ϕ value of 10.5% and slow dielectric relaxation, almost 10% decay of ϕ after 24 h. The optical band-gap of 15%BT/PC composite film decreases after poling indicates that the orientation of BaTiO 3 ferroelectric nanocrystals aligns due to the effect of polarization, from 3.8 eV to 3.67 eV. From the XRD results, we consider that the preferential alignment orientation of BaTiO 3 ferroelectric nanocrystals after poling is [001]. This suggests that in-situ transmittance measurement is a simple and effective way to evaluate the polarization and dielectric relaxation behaviors of ferroelectric nanocrystals/polymer systems. |
| Databáze: | OpenAIRE |
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