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    Analysis of dielectric properties of Fe and Co coated thin films on PbZrTiO3
    (2024) Kahyaoglu, Aliye; Demirkaya, Ahmet; Kafkas, Dilek
    PbZr1-xTixO3 ceramic material, which has ferroelectric-piezoelectric properties, attracts great attention from researchers due to its electrical and electromechanical properties. In this study, Fe and Co materials with ferromagnetic properties were coated separately on the ferroelectric-piezoelectric PbZr0.5Ti0.5O3 (PZT) ceramic material by vacuum evaporation technique. The variation of dielectric properties such as dielectric constant, dielectric loss, loss tangent, cole-cole diagram of the prepared thin films with frequency was examined. Dielectric constant, dielectric loss, loss tangent, cole-cole diagram of pure PZT, Fe-coated PZT and Co-coated PZT thin films were measured with an impedance analyzer as a function of frequency (in the range of high frequency) at room temperature.
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    Electro-optical Performance Investigation of Cholesteric Liquid Crystal Containing Azo Dye: Light Shutter Device Application
    (Springer, 2021) Kocakulah, Gulsum; Koysal, Oguz; Kahyaoglu, Aliye
    In this study, the effect of chiral dopant concentration on electro-optical and dielectric properties of a cholesteric liquid crystal (CLC) composite was investigated, and a dye-doped cholesteric liquid crystal (DDCLC) light shutter was developed. The electro-optical properties of samples were investigated by electro-optical switching method without the use of a polarizer. The dielectric characterization of the composites were also realized using dielectric spectroscopy technique with a wide frequency range. Significant electro-optical and dielectric parameters, such as transition voltages, complex dielectric constant, dielectric anisotropy and light transmission values of composites were found from the experimental data. The obtained results show that the chiral dopant causes changes in electro-optical and dielectric parameters of CLC, and the developed DDCLC light shutter can be used in optoelectronic device applications.