• Nilgun Ozpozan Kalaycioglu

      Articles written in Bulletin of Materials Science

    • Synthesis and luminescence properties of BaTiO3:RE (RE = Gd3+, Dy3+, Tb3+, Lu3+) phosphors

      Esra Korkmaz Nilgun Ozpozan Kalaycioglu

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      Gd3+, Dy3+, Tb3+ and Lu3+ doped BaTiO3-based phosphors were synthesized with modified solidstate technique at 1000 °C. The optimization of reaction conditions were carried out by thermogravimetry and differential thermal analysis methods (DTA/TG). The reaction products obtained in an air atmosphere were characterized by X-ray powder diffraction (XRD). Surface and elemental analyses were performed by using an SEM instrument. The excitation and emission spectra were recorded by photoluminescence spectrophotometer (PL). The thermoluminescence (TL) properties of BaTiO3 samples doped with Gd3+, Dy3+, Tb3+ and Lu3+ were investigated.

    • Synthesis, characterization and oxide ionic conductivity of 𝛽-type solid solution in bismuth oxide doped with ytterbium oxide binary system

      Esra Öztürk Nilgun Ozpozan Kalaycioglu Serkan Dayan Handan Ozlu

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      In this study, after doping Yb2O3 substance to 𝛼-Bi2O3 substance in the range of 1% ≤ 𝑛 ≤ 8% in a series of different mole ratios, heat treatment was performed by applying a cascade temperature rise in the range of 700–790 °C for 48 and 120 h and new phases were obtained in the (Bi2O3)1−𝑥 (Yb2O3)𝑥 system. After 48 h of heat treatment at 750 °C and 120 h of heat treatment at 790 °C, mixtures containing 1–8% mole Yb2O3 formed a tetragonal phase. With the help of XRD, crystal systems and lattice parameters of the solid solutions were obtained and their characterization was carried out. Thermal measurements were made by using a simultaneous DTA/TG system. The total conductivity (𝜎T) in the 𝛽-Bi2O3 doped with Yb2O3 system was measured using four-probe d.c. method.

    • Yellow phosphors doping with Gd3+, Tb3+ and Lu3+ in MTiO3 (M = Mg and Sr) luminescence properties

      Esra Korkmaz Nilgun Ozpozan Kalaycioglu V Emir Kafadar

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      This paper reports Gd3+, Tb3+ and Lu3+ doped MTiO3 (M = Mg and Sr)-based phosphors which were synthesized by the conventional solid-state reaction method, their crystal structures and luminescence properties were investigated. X-ray diffraction patterns (XRD) showed that phosphors sintered at 1000 °C for 2 h were the pure SrTiO3 and MgTiO3 phases. The optimization of reaction conditions was carried out by thermogravimetry and differential thermal analysis (DTA/TG) methods. Surface and elemental analyses were performed by using SEM instrument. The excitation and emission spectra were recorded by a photoluminescence spectrophotometer (PL). The thermoluminescence (TL) properties of MgTiO3:RE (RE = Gd3+, Tb3+, Lu3+) and SrTiO3:RE (RE = Gd3+, Tb3+, Lu3+) were investigated.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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