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    Ce/Sm co-doped hydroxyapatites: synthesis, characterization, and band structure calculation
    (Springer, 2020) Kaygılı, Ömer; Vural, Gülay; Keser, Serhat; Yahia, İ.S.; Bulut, Niyazi; Ateş, Tankut; Köytepe, Süleyman; Temüz, Mehmet Mürşit; Ercan, Filiz; İnce, Turan
    In this paper, Ce/Sm co-doped hydroxyapatites (HAps) were synthesized by a wet chemical route. The amount of Ce was kept at constant at the value of at.% 0.4, and the second dopant of Sm was used at different amounts of at.% 0, 0.6, 1.2, and 1.8, respectively. The effects of these co-dopants on the crystal structure, morphology, and thermal properties of HAp were determined experimentally using X-ray diffraction (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA), and thermogravimetric analysis (TGA). Furthermore, the band structure of the prepared samples was modeled theoretically using the quantum calculations of the density of states and band structure. A gradual increase from 26.56 to 36.23 nm in the crystallite size was observed. Although the amounts of the co-dopants of Ce and Sm did not affect the thermal stability and microstructure of HAp, its crystal structure-related parameters were affected by the amount of these co-additives. The partial substitution of both co-dopants was detected. The 0.4Ce-1.2Sm-HAp sample may be considered as the best crystal structure with a steady-state. It was seen that the band structure and density of states were also affected by these co-dopants. The bandgap value decreased gradually from 4.6078 to 4.0477 eV due to these dopants.
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    Farklı Element Katkılı Sodyum Fosfat Camlarının Sentez ve Karakterizasyonu
    (Bilecik Şeyh Edebali Üniversitesi, 2021) Keser, Serhat; Tatar, Cengiz; Ateş, Tankut; İnce, Turan; Kaygılı, Ömer
    Bu çalışmada, yaş kimyasal yöntemi ile üretilen Ba ve Li katkılı sodyum fosfat (NaPO3) camları karakterize edildi. Ba katkılı numunelerin tamamının ve en yüksek Li katkısına sahip numunenin amorf yapıya sahip olduğu görüldü. Bunların haricindeki tüm numunelerin kristal yapıya sahip olduğu gözlendi. Fourier dönüşümlü kızılötesi (FTIR) spektroskopisi sonuçları NaPO3 yapısının oluşumunu desteklemektedir. Morfoloji, katkıların türü ve bunların miktarından etkilendi.
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    Synthesis and Characterization of Co-Doped SnO2 Samples
    (Bilecik Şeyh Edebali Üniversitesi, 2020) Ateş, Tankut; Kaygılı, Ömer; Bulut, Niyazi; Okur, Havva Esma; Keser, Serhat; Yahia, İ.S.; Köytepe, Süleyman; Seçkin, Turgay; Özcan, İmren; İnce, Turan
    The un-doped and Co-doped SnO2 samples having high crystallinity were successfully prepared. The effects of Co content on the structural, thermal and morphological properties of SnO2 were investigated. Changes in the crystallite size and unit cell parameters were detected with adding of Co. The phase composition did not alter with the addition of Co. Both X-ray diffraction and Fourier transform infrared results confirmed the formation of the SnO2 structure for each sample. The thermal stability of the as-produced samples from room temperature to 900 °C was observed. The morphology was affected by Co content, and energy dispersive X-ray results verified the introduction of Co into the SnO2 structure.