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Articles by Khalid Haneen Abass
Total Records ( 2 ) for Khalid Haneen Abass
  Khalid Haneen Abass , Mohammed Hadi Shinen and Ayad F. Alkaim
  The aim of this research is to prepare TiO2 films on Indium Tin Oxid (ITO)-glass substrates with various nano-layers via. sol-gel method and study the properties that make these films suitable for solar cell application. Polycrystalline TiO2 films are resulting from X-Ray Diffraction (XRD) examination with preferred orientation along (101) plane appear for the films with thickness more than 107 nm (3 layers) at 2θ = 25.62°. Other peaks appear (211), (004) and (200) at 2θ = 30.27, 35.49 and 48.69, respectively and the crystallite size ranged from 15-32 nm for the prepared films. The homogeneity of the films is appear from the scanning electron microscope in addition of smooth and free of pinholes. UV-Visible spectrophotometer use to recording the transmittance spectra in the range of 360-1000 nm. The energy gaps were determined by Touc Model and from the dispersion parameters which found good comparable to be 3.21 eV for the film thickness 155 nm (5 layers). The energy loss of electrons which travelling through surface and bulk of material also determined. Urbach energy is increase with the increasing of film thickness. Dispersion parameters (Eo, Ed) determined from Wemple and DiDomenco relationship.
  Ali Razzaq Abdul Ridha , Ehssan Al-Bermany , Shaymaa Al-Rubaye and Khalid Haneen Abass
  Different concentrations of WO3 nanoparticles were added to Bi1.6Pb0.4Sr2Ca2Cu3O10+δ composite its superconducting properties as well as its microstructural development were studied. Powder pellets made-up using method of solidstate reactions. Critical transition Temperatures Tc of samples measured by technique of fourpoint probe. It found that addition of nanoparticles WO3 up to the 0.2 wt.% enhances the Tc , the highest Tc was exhibited at 120 K while excessive addition suppressed it. WO3 nanoparticles introduced effective pinning centers. The gross structural characteristics of synthesized High-Tc Superconductors (HTSc) was investigated through X-ray diffractions. The results showed both high and low phases exist in models with orthorhombac structures for all samples. Grains shape and their connectivity studied with SEM. EDX analysis used to test the chimical compositions of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor. XRD, SEM and electrical measurements were done on the samples to deduce the best properties desired for the superconductor.
 
 
 
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