Thesis & Dissertations

Effect of Nano (Co0.5Zn0.5) Fe2O4 Addition on the Formation and the Physical Properties of (Cu0.5Tl0.5)-1223 Phase


This work investigated the e ect of di erent nano-sized Co0:5Zn0:5Fe2O4 particles addition on superconducting (Cu0:5Tl0:5)-1223 phase. Nano-sized particles were synthesized by Co-precipitation method and characterized using X-ray powder di raction (XRD), transmission electron microscope (TEM). Superconducting composites of type (Co0:5Zn0:5Fe2O4)x=(Cu0:5Tl0:5)-1223 with 0.00 < x < 0.2 wt.% were prepared by the conventional solid-state reaction technique and characterized using XRD, scanning electron microscopy (SEM) and ion beam analysis. XRD results indicate that an improvement in the relative volume fraction for (Co0:5Zn0:5Fe2O4)x=(Cu0:5Tl0:5)-1223 composites was detected by increasing x up to x = 0.08 wt.% and the lattice parameters unchanged by increasing the addition of nano-sized Co0:5Zn0:5Fe2O4 particles. The PIXE results show that the elemental contents are very close to the starting values. PIXE technique is more sensitive for detecting the low elemental contents, especially for the nanoparticles. RBS was more accurate technique for determination the oxygen content than PIXE technique which is found very close to the theoretical values. From both the electrical resistivity and magnetization measurements, the superconducting transition temperature and hole-carriers concentration are found be increased by increasing the addition of nano-sized Co0:5Zn0:5Fe2O4 particles up to 0.08 wt.%. The temperature dependence of the real X' and imaginary X'' components of the magnetic susceptibility (ACMS) were measured at various ac magnetic field amplitude (3-15 Oe). Finally, X- and Q-Band (9.3 and 33.9 GHz) Electron Paramagnetic Resonance (EPR) spectra were measured at room temperature and the g-values were calculated as a function of different nano-sized particles additions at room temperature.


Nermine Awad Alsayyed


Ramadan Khamice Awad, Mohammad Riad Saker