Synthesis and Characterization of Tl-1223 Substituted by Scandium
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第11期
论文作者：R.Awad A.Al-Zein I.H.Ibrahim
文章页码：1079 - 1084
摘 要：X-ray powder diffraction,scanning electron microscopy（SEM）,energy dispersive X-ray,electrical resistivity and AC-magnetic susceptibility measurements have been performed for polycrystalline superconducting samples of type TIBa2Ca2-xScxCu3309-δ（0.0 ≤x≤0.6）.The powder X-ray diffractograms indicate that the tetragonal structure of TI-1223 is not affected by Sc-substitution whereas the lattice parameters are changed.The X-ray analysis indicates that the low-contents of scandium（x） enhance the formation of TI-1223 and reduce the secondary phases.The grain-size determined by SEM decreases as x increases.The electrical resistivity measurements show suppression in the superconducting transition temperature,TC,and an increase in both the residual resistivity and the superconducting transition width as x increases.The suppression in TC is attributed to the hole-filling mechanism.
R.Awad1，A.Al-Zein2,3，I.H.Ibrahim1,3
1. Physics Department,Faculty of Science,Alexandria University
摘 要：X-ray powder diffraction,scanning electron microscopy（SEM）,energy dispersive X-ray,electrical resistivity and AC-magnetic susceptibility measurements have been performed for polycrystalline superconducting samples of type TIBa2Ca2-xScxCu3309-δ（0.0 ≤x≤0.6）.The powder X-ray diffractograms indicate that the tetragonal structure of TI-1223 is not affected by Sc-substitution whereas the lattice parameters are changed.The X-ray analysis indicates that the low-contents of scandium（x） enhance the formation of TI-1223 and reduce the secondary phases.The grain-size determined by SEM decreases as x increases.The electrical resistivity measurements show suppression in the superconducting transition temperature,TC,and an increase in both the residual resistivity and the superconducting transition width as x increases.The suppression in TC is attributed to the hole-filling mechanism.
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