Browsing by Author "Ataoglu S."

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Structural and mechanical properties of (Co/Mg) co-doped nano ZnO
(2015-06-01) Asikuzun E.; Donmez A.; Arda L.; Cakiroglu O.; Ozturk O.; Akcan D.; Tosun M.; Ataoglu S.; Terzioglu C.
The (Co/Mg) co-doped ZnO systems (ZnMgCoO) were synthesized as polycrystalline nanoparticles using the sol-gel technique. The effects of Co/Mg co-addition to the structural and mechanical properties of ZnO nanoparticles were investigated. Microstructural properties, such as phases, crystal structures and grain sizes are characterized by using X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM). The microhardness values of the samples were evaluated by the Vickers tester. In the samples of the Co>Mg ratio, Indentation Size Effect (ISE) behaviors were observed. On the other hand, in the samples of the Mg>Co ratio, Reverse Indentation Size Effect (RISE) was observed. These were analyzed in detail utilizing the models for materials hardness analysis found in literature.
Structural and mechanical properties of transition metals doped ZnMgO nanoparticles
(2013-02-01) Arda L.; Ozturk O.; Asikuzun E.; Ataoglu S.
Zn0.94Mg0.01TM0.05O (TM=Ni, Co, Mn, and Cr) solutions were synthesized by the sol-gel technique using Zn, Mg, Ni, Co, Mn, and Cr based alkoxide. The effects of doping transition metals and annealing temperature on structure and mechanical properties of the ZnMgO nanoparticles were systematically investigated. The phases, crystal structures, sizes and microstructures of the samples were characterized using X-ray diffraction and scanning electron microscope. Microhardness values were measured using a digital Vickers microhardness tester. The experimental results were analyzed using Kick's Law, Proportional Specimen Resistance (PSR), Elastic/Plastic Deformation (EPD) models, and Hays-Kendall (HK) approach. The microhardness values of Ni, Co, Mn, and Cr doped ZnMgO nanoparticles gradually decreased, respectively. The Indentation Size Effect behavior was observed. The grain sizes of ZnMgNiO, ZnMgCoO, ZnMgMnO, and ZnMgCrO nanoparticles were calculated approximately to be 26.36, 26.22, 22.89, and 19.24nm using the Sherrer equation, respectively. © 2012 Elsevier B.V.
Structural and mechanical properties of ZnMgO nanoparticles
(2014-01-10) Tosun M.; Ataoglu S.; Arda L.; Ozturk O.; Asikuzun E.; Akcan D.; Cakiroglu O.
This study reports the effect of annealing temperature on the structure and mechanical properties of Zn0.95Mg0.05O bulk samples by using digital Vickers microhardness tester, X-ray diffraction analysis, scanning electron microscopy and electron dispersive X-ray measurements. The samples were prepared using Zn and Mg based alkoxed by the sol-gel technique and annealed at various temperatures (500, 600, 700 and 800°C). Vickers microhardness, elastic modulus, yield strength and fracture toughness values of Zn0.95Mg0.05O bulk samples were separately calculated and compared with each other. The experimental results of hardness measurements were analyzed using Meyer's law, Proportional Specimen Resistance (PSR) and Elastic/Plastic Deformation (EPD) models and Hays-Kendall (HK) approach. Finally, it was seen that HK approach is the most successful model for the microhardness analysis of these materials. © 2013 Elsevier B.V.