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    Effect of Al0.1Ga0.9As thickness on the structural, optical, thermal, and electrical properties of (Al0.1 Ga 0.9As)/GaAs heterojunctions
    (Elsevier Ltd, 2023) Al-Naghmaish, Aishah; Ghrib, Taher; Dakhlaoui, H.; AL-Saleem, N.K.; Ercan, F.; Kayed, Tarek S.; Elibol, Erdem
    Al0.1Ga0.9As nano-films of various thicknesses were deposited on GaAs substrate and examined using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), UV–Visible spectrophotometry, Photoluminescence (PL), Electrochemical Impedance Spectroscopy (EIS), and Photothermal Deflection (PTD). The PTD technique is used to analyze the effect of Al0.1Ga0.9As thickness on thermal properties and showed its sensitivity to weak structural changes. By increasing the Al0.1Ga0.9As thickness, the crystallinity was degraded, an infrared emission centered at 997.4 nm whose intensity is the highest for 50 nm was observed. A pn junction was formed for thicknesses higher than 400 nm, the band gap was increased from 1.59 to 1.68 eV. The thermal conductivity increased from 35.3 to 37.3 W m? 1 K?1 and the thermal diffusivity increased from 0.195 to 0.22 cm2 s?1. As a result of this investigation, the Al0.1Ga0.9As/GaAs can be considered for potential applications in photoelectric and thermoelectric devices. © 2023 The Author(s)
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    Structural, optical and photocatalytic properties of cerium doped Ba2TiMoO6 double perovskite
    (Elsevier B.V., 2023) Ghrib, Taher; Al-Otaibi, A.; Ercan, F.; Manda, Abdullah A.; Özçelik, Beraat; Ercan, İsmail
    Ce doped Ba2TiMoO6 nanomaterials with different Ce concentrations were synthesized by solid state technique. It was determined by the XRPD method that the atomic and molecular structures of Ba2Ti1-xCexMoO6 [x=(1,3,5,7)%] compound was in the tetragonal crystal system and crystallized in the P4mm space group. The purification parameters were found to be gof 1.2 and Rf 1.60. The Scanning Electron Microscopy, Transmission Electron Microscopy, and surface area analysis were used to examine the surface morphology. The UV–Vis diffuse reflectance and photoluminescence spectroscopies were used to investigate the optical properties. The study results showed the successful synthesis of pure and Ce doped Ba2TiMoO6 nanopowders, characterized by 8–20 nm grain size, 3.41–3.6 eV bandgap, and violet emission at 426.67 nm wavelength. The photocatalytic activities of the produced samples were tested against Methyl and it was observed that these activity values increased with the percentage of Ce doping. © 2022 Elsevier B.V.
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    Structural, optical, photoluminescence and radiation-shielding investigation of magnesium doped barium zirconate (BaZrO 3 ) ceramics
    (Pergamon-Elsevier Science Ltd, 2024) Ghrib, T.; Ben Ali, A.; Ercan, F.; Mhareb, M. H. A.; Al-muteliq, S. Y.; Ercan, I.; Kaygili, O.
    Magnesium-doped barium zirconate (BaZrO3) powders with various Mg atomic ratios (0.1, 0.2, 0.3, 0.4, and 0.5) have been synthesized by using the solid-state reaction method. The structure and microstructure were studied via scanning electron microscopy, X-ray powder diffraction (XRD), energy dispersive X-ray (EDX), Raman, and Fourier transform infrared (FTIR) spectroscopy. The optical properties were investigated using UV-Vis and photoluminescence spectroscopy. XRD results showed that the synthesized powders have a cubic crystal system with a grain size in the range of 23-27 nm. The band gap is estimated to be about 3.5-3.59 eV. The photoluminescence shows UV and visible emissions. The neutron and gamma shielding features were calculated and assessed based on Phy-X software of energies ranging from 0.015 to 15 MeV. The gamma shielding parameters were generally reduced by adding Mg instead of Ba. The neutron shielding parameter was enhanced gradually. Based on these results, the ability to use the synthesized samples in radiation and neutron shielding applications can be deduced.