Abstract
The Bi1/2Na1/2TiO3 (BNT) thin film has been researched as an excellent candidate of lead-free ferroelectric materials. We synthesized BNT thin film on Si wafers or quartz glass by sol-gel spin coating method. The homogeneous and crack-free BNT thin film was synthesized by cost effective solution sol gel coating method. The main crystal phase of the film was identified as Bi1/2Na1/2TiO3. The BNT thin film which was coated 3 times and heat-treated at 700 °C had about 70% of transmittance in the ultra-violet visible (UV-VIS) light wavelength region. The calculated band gap energies from the UV transmittance spectra were 3.0 and 3.5 eV for indirect and direct transition, respectively and the refractive index of BNT thin film was 2.16 at 898 nm of wavelength. The hardness and elastic modulus of the film were about 9 and 136 GPa at 10 mN load, where the penetration depth was about 220 nm. BNT thin film showed the diffuse type of dielectric properties due to its Na+ and Bi3+ ions in A′1/2A″1/2BO3-type perovskite structure and the dielectric constant was about 10 until 300 °C and showed maximum value at 550 °C, 450 at 1 kHz.
Original language | English |
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Pages (from-to) | 306-310 |
Number of pages | 5 |
Journal | Journal of Sol-Gel Science and Technology |
Volume | 55 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2010 Sep 1 |
Keywords
- Band gap energy
- Dielectric
- Nano-indentation
- Raman spectroscopy
- Sol-gel
- Transmittance
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Chemistry(all)
- Biomaterials
- Condensed Matter Physics
- Materials Chemistry