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Öğe Er3+ doped chalcogenide glasses and sputtered thin films: structural and spectroscopic characterization(Ieee, 2016) Kabalci, Idris; Hewak, Daniel W.In this research, we report Er3+ doped chalcogenide based glasses, well known for infrared transparency with various applications in the photonics and optoelectronics. Er3+ doped chalcogenide glasses were prepared by using vertical furnace with an argon gas atmosphere. For the structural and spectroscopic measurements, thin films at about 460nm thicknesses were deposited by using radio-frequency (RF) magnetron sputtering technique. Er3+ deposited thin films were annealed at different temperature as 450, 500, 550, and 600 degrees C in the tube furnace and rapid thermal annealer (RTA) at 2 degrees C/min, and 10 degrees C/min heating rate, respectively. As a result, absorptions, luminescence, and structural properties of the Er3+ ion doped GLS thin films were affected from different annealing process.Öğe Mechanical, Structural and Thermal Properties of Transparent Bi2O3-Al2O3-ZnO-TeO2 Glass System(Springer, 2017) Kabalci, Idris; Koc, Erkan; Ozturk, Sirri SemihOxide based optical glass materials has important potential material in many applications from fiber optic to sensor due to the high transparency and amourphous structures. The objective of this study is to synthesize the novel optical glass materials based on the bismuth and aluminum contents to be able to determine the physical, chemical and mechanical properties by considering the systematic experimental steps. In this study, Bi2O3-Al2O3 based tellurite optical glasses have been prepared by using conventional melt quenching method as a function of the both Bi2O3 and Al2O3 compositions. There is a strong interactions between the glass former and modifier ions that might effect on the structure and mechanical properties. During the experimental steps, thermal, structural and mechanical properties of the prepared glass materials have been determined considering the DTA/DSC, FT-IR spectroscopy, SEM and Vicker's hardness techniques, respectively. Thermal parameters, like glass transition, T-g, onset, T-x, crystallization, T-p, and melting, T-m, temperatures were obtained by using DTA scan.Öğe Novel compositions of Bi2O3-ZnO-TeO2 glasses: Structure and hardness analysis(Elsevier Science Bv, 2017) Kabalci, Idris; Zheng, Jiayu; Wang, Liping; Tan, Linling; Xue, Yafei; Zhang, Ziyang; Peng, MingyingTellurite based glasses have been prepared with various glass compositions such as yBi(2)O(3)-xZnO-(100 - x - y) TeO2 glass system (y = 0.2, 1.0, 2.0, 3.0, 4.0, 5.0, and 8.0 mol% ratio and x = 14, 19, 19.8, and 20 mol%). The purpose of the work is to investigate the effect of glass compositions on the structure and hardness under the indentation loading test. Up till now, the experiences of the preparation of tellurite based glasses showed that it has high fragility structure at room temperature compared to boroxide, and chalcogenide-based glass materials. In this study, the thermal, mechanical and structural properties of Bi - based tellurite optical glass materials were investigated at room temperature. Results indicated that increased refractive index ratio of Bi has pronounce effect upon the transition temperature while the hardness value of the lassy material showed a reduction in response to this increased refractive index value of Bi. The obtained results further could be correlated with compositions that effects on the structural changes [for TeO4 (tbp) to TeO3 (tb)] having non-binding oxygen (NBO) due to the elastic deformation of Te-O bonding and expansion of interatomic distances when considered the data of the Vickers' hardness, FT-IR, and Raman spectra. Here, it can also be emphasized that obtained the thermal stability, (T = T-x T-g), of the glass material, decreases from 80 to 37 degrees C as the melting temperature increases from 800 to 1025 degrees C, possibly leading to a decrease in microhardness and deformation in the glass materials. (C) 2017 Elsevier B.V. All rights reserved.Öğe Thermal analysis and linear optical properties of (1-x)TeO2-(x)ZnCl2 optical glasses for photonic applications(Ieee, 2015) Kabalci, Idris; Korpe, Nese Ozturk; Polat, RefikThe investigation covers the thermal and linear optical properties of binary TeO2-ZnCl2 optical glass systems contain different ZnCl2 compositions ranging from 10 to 40mol%. Preparation of the glass systems were realized by melting the mixture of TeO2 and ZnCl2 chemicals in a platinum crucible at 850 degrees C for 60 min in air. In the experiments, thermal analysis was performed to determine the thermal characteristics such as, glass transition (T-g), crystallization (T-p), and melting (T-m) temperatures for different heating rates (B=10, 20, 30 and 40 degrees C/min) by using the differential thermal analysis (DTA) plot. By considering the DTA plots, the crystallization activation energies were determined by using the Ozawa and modified Kissinger equations. Finally, thermal analysis show that the crystallization activation energies were 487.6kJ/mol, 215.8kJ/mol, 392.kJ/mol, and 273.3kJ/mol for the x=10, 20, 30, and 40mol% ZnCl2 contents, respectively. Optical band gaps (direct and indirect) and Urbach energies of the glass samples were estimated from the absorption spectra measured between 300 and 800nm. The direct band gap energies decrease from 3.65 eV to 3.35 eV, and indirect band gap energies also decrease from 3.59 eV to 3.30 eV by increasing the ZnCl2 content from 10 to 40 mol%, respectively.Öğe Ultra-Wideband Positioning System Using TWR and Lateration Methods(Assoc Computing Machinery, 2018) Duru, Anday; Sehirli, Eftal; Kabalci, IdrisIndoor wireless positioning systems enables location based applications to work properly inside buildings. Since GPS technology could not supply desired precision in indoor environment, there has been many positioning systems developed based on different technologies to solve localization problem. In this paper, indoor navigation system based on Ultra-Wideband technology has been proposed. Then, ranging model of the tracking system is established. Trilateration, Least Square Estimation and Centroid Method positioning algorithms are applied to provide a realistic comparison between them. Results are analyzed to compare the accuracy between different algorithms and the ideas are shared to improve the current study.
