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RISS 인기검색어
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- 저자 : Suleyman Kerli (검색결과 2 건)
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Synthesis, Characterization and Supercapacitive Performances of Yttrium Doped Cobalt Oxide Films
Suleyman Kerli 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.7
Cobalt oxide and yttrium doped cobalt oxide films are produced with spraying method. The films are coated on glass and indium tin oxide substrates at 450 C. The obtained films have been examined by X-ray diffractometer and scanning electron microscopy devices. In this examination, yttrium doping is seen to cause deterioration in crystal scructure. Moreover, films’ electrochemical features have been studied. The electrochemical measurements of samples are performed with cyclic voltammetry, electrodes supercapasitor curves and impedance spectrometers have been measured. Electrochemical super capasitor performance test has been measured in 6 M KOH for electrolyte and has been studied with the speed of 0.1 V/s. It has been calculated that yttrium doping increases capacity and the maximum capacitance value is measured as 296 F/g
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Structural, Mechanical and Magnetic Properties of Fe – 40-at.% Al Powders during Mechanical Alloying
Baris Avar,Musa Gogebakan,Sadan Ozcan,Suleyman Kerli 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.5
Nanocrystalline Fe – 40at.% Al alloy powders were prepared by using a mechanical alloying (MA)process with a planetary high-energy ball mill. The structural and the morphological propertiesof the powders were investigated by means of X-ray diffraction (XRD), and scanning electronmicroscopy (SEM), respectively. A disordered Fe(Al) solid solution with bcc crystal structure wasformed after 10 h of MA. Longer MA durations introduced ordering in the alloyed powders. Thefinal crystallite size was found to be as small as 5 nm whereas the internal strain was found toreach a final value of 2.1%. Also, the lattice parameter quickly increased to a maximum value of0.2926 nm at 30 h of MA, and then decreased to a value of 0.2873 at 80 h of MA. SEM resultsshowed variations in the shapes and the sizes of the particles in the powders at different stages. Furthermore, the microhardness values were found to increase gradually with increasing MA timedue to work hardening, grain refinement and solid-solution formation. Magnetic properties such asthe saturation magnetization (Ms) and the coercive field (Hc) were calculated from the hysteresisloops, and the results are presented as functions of the MA time.
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