Ni0.5Zn0.5Fe2O4ferrite, was produced by solution combustion synthesis method. In this way, by heating a solution containing an oxidizer and fuel, highly exothermic reaction occurs that results in the production of powder products with the desired compound. Powders produced in three various ratios of the fuel and oxidizer and 1 different modes of fuels (urea, glycine and combinations of these two fuels) were prepared and compared with each other. The maximum combustion temperature occurred in a sample of F/O=1. Based on the results of the XRD analysis, in all samples, spinel ferrite phase crystallized. FESEM photos shows that the type and amount of fuel has a significant impact on morphology and porosity of produced spinel ferrite. According to magnetic measurements, maximum saturation magnetization were obtained in F/O=1.4 and urea which were 67.22 emu/g. Also, all samples have narrow hysteresis loops, which indicates their soft magnetic properties.
In this research LiMn1.5Ni0.5O4 nano powders that are used as cathode material for lithium-ion batteries were prepared by solution combustion synthesis route. Cetyl trimethyl ammonium bromide (CTAB), mixture of “CTAB and glycine” and also mixture of “CTAB and citric acid” were used as fuel using fuel to oxidant ratio of 0.5. The effect of fuel type on microstructure and electrochemical properties of the powders was studied. Differential thermal analysis (DTA) results demonstrated that the gel combustion intensity increases in presence of glycine and citric acid fuels. XRD results of the powders synthesized by mixture of “citric acid and CTAB” and “glycine and CTAB” shows formation of single phase LiMn1.5Ni0.5O4 with a higher crystallinity. BET results show that the surface area of the powders prepared by mixture of fuels are equal to 400 m2/g and 269 m2/g for “CTAB and glycine” and” CTAB and citric acid” mixtures respectively that are higher than the surface area of the powders prepared by CTAB. SEM results show spherical fine particles (15 to 10 nm). The highest discharge capacity (125mAh/g) was obtained for the powders synthesized with the mixture of citric acid and CTAB due to its high surface area and small cell parameter (8.1671 Å).
Shiva Poorali, Dr S. M. Masoudpanah, Dr S. Alamolhoda, Dr R. Amrollahi, Volume 11, Issue 2 (9-2022)
Abstract
In this research zinc oxide particles prepared by solution combustion synthesis using zinc nitrate as oxidant and citric acid as fuel. The effect of citric acid to oxidant ratio (0.5, 1, 2 and 3) on phase formation, microstructure, optical properties and photocatalytic performance of the powders were studied using XRD, SEM and DRS techniques. Single phase ZnO particles by wurtzite structure was formed in all samples with nearly spherical morphology. Low band gap energy of the samples prepared by fuel to oxidant ratio of 1 might be due to its low crystallinity. The highest absorption efficiency (16%) and photodegradation of methylene blue in this sample (98%) during 180 min under UV- irradiation could be due to its high specific surface area.
