Conference Presentations by Aryan Kheyrdan
Barium titanate (BaTiO3) is a well-known ferroelectric ceramic with high dielectric constant and ... more Barium titanate (BaTiO3) is a well-known ferroelectric ceramic with high dielectric constant and good electromechanical properties, which makes it the best candidate for replacing the lead zirconium titanate (PZT) in the industry on account of its non-toxicity compared to PZT. Barium titanate samples are synthesized via modified sol-gel method and the sol is acid-water based. Various calcination parameters and their impact on impurity contents of barium titanate nanostructured powders are carried out. Our goal is to discover the lowest possible time and temperature required for complete calcination of the samples with lowest impurity content alongside realizing the most important factor in reducing impurity contents between time, temperature, and heating rate. With the aid of X-Ray diffraction analysis, these impurities are recognized and efforts are made to eliminate them as much as possible. The best results by far is obtained in heating rate of 40 °C/min up to 650 °C and holding in that temperature for 1 hour. The grain size and morphology of calcined barium titanate powder with the best chosen condition is obtained from field emission scanning electron microscopy, designating particle size of about 50 nm.
Papers by Aryan Kheyrdan
Structural, electrical, and optical properties of sol-gel-derived zirconium-doped barium titanate thin films on transparent conductive substrates
Journal of Sol-Gel Science and Technology
Barium zirconium titanate (Ba(ZrxTi1−x)O3, BZT) super smooth thin films are synthesized through m... more Barium zirconium titanate (Ba(ZrxTi1−x)O3, BZT) super smooth thin films are synthesized through modified sol-gel dip
coating route on fluorine-doped tin oxide substrates with a suitably low calcination temperature. The Fourier tranformed
infrared spectroscopy proves that impurities and starting materials are completely removed in the calcination process.
Crystallographic phases of the samples are identified by the X-ray diffractometry and confirms that all samples are
crystallized into a single perovskite phase. Introducing zirconium into the structure causes a reduction in dielectric constant
of barium titanate. The optical properties of the films are also investigated. The results indicate that all samples are highly
transparent and zirconium reduces the absorption coefficient. Moreover, the band gap energy of barium titanate increases
when doped with zirconium and the highest band gap energy of about 3.71 eV along with the lowest dielectric constant of
850 at frequency of 100 kHz are obtained in 15 at.% zirconium-doped sample.
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Conference Presentations by Aryan Kheyrdan
Papers by Aryan Kheyrdan
coating route on fluorine-doped tin oxide substrates with a suitably low calcination temperature. The Fourier tranformed
infrared spectroscopy proves that impurities and starting materials are completely removed in the calcination process.
Crystallographic phases of the samples are identified by the X-ray diffractometry and confirms that all samples are
crystallized into a single perovskite phase. Introducing zirconium into the structure causes a reduction in dielectric constant
of barium titanate. The optical properties of the films are also investigated. The results indicate that all samples are highly
transparent and zirconium reduces the absorption coefficient. Moreover, the band gap energy of barium titanate increases
when doped with zirconium and the highest band gap energy of about 3.71 eV along with the lowest dielectric constant of
850 at frequency of 100 kHz are obtained in 15 at.% zirconium-doped sample.