Authors:G. M. Taha, M. N. Rashed, M. S. El-Sadek and M. A. Moghazy
BiFeO3 (BFO) nanopowder was synthesized in a pure form via a sol- gel method based on glycol gel reaction. Effect of drying and preheating temperature on preventing other phases was studied. Many parameters were studied as calcination temperature and time & stirring temperature as well. The prepared powder was characterized by X-Ray Diffraction of powder (XRD) and Transmission Electron Microscope (TEM). High pure BiFeO3 was obtained by preheated process at 400 °C for 0.5 h and calcination at 600 °C for 0.5 h without any impurities compared to dry at110 °C.
Authors:N. El-Assy, M. El-Dessouky and I. Gar Al-Alm Rashed
Hydrogen and methane produced during the -radiolysis of 2-propanol have been measured in the absence and presence of 0.1 and 0.01 M ketone (1-(2-furanyl)-1-hexanone) at different doses. In the absence of ketone at 100 kGy, the hydrogen and methane yields were found to be G(H2)=5.1 and G(CH4)=2.02. At lower ketone concentrations the hydrogen and methane yields were G(H2)=4.35 and G(CH4)=1.83, while higher concentrations decreased the above values to G(H2)=2.95 and G(CH4)=1.33, respectively. The radiolytic mechanism is discussed in detail.