Characterization of zinc ferrite produced by the ceramic method | Mery Cecilia

Summary :
⁣A solid-solid reaction took place at 1000°C during 4 h, using a mixture of pure iron oxide- Fe2O3 and pure zinc oxide – ZnO in order to synthesize zinc ferrite-ZF of different compositions: (S1) Fe2O3/ZnO:3/2, (S2) Fe2O3/ ZnO:1/1, (S3) Fe2O3/ZnO:4/1 and (S4) Fe2O3/ ZnO:2/1. Each of these mixtures were milling during 24 h before the thermic treatment carried out. S1, S2, S3 and S4 samples were became to M1, M2, M3 and M4 samples respectively, which after that were thermally characterized using DSC, DTA and TG techniques. In sequence the ZF produced were examined using XRD, optical and magnetic techniques, SEM & TEM. XRD analysis shows up as contains of equimolar ZF: M3 (73.20%), M4 (28.00%) and M2 (2.10%) as non-stoichiometric phases of ZF: 31.80% of Zn0.95Fe1.78O3.71 and 30.40 % of Zn1.08Fe1.92O4 in M4; Zn0.97Fe2.02O4 in M3 and 35.30% of Zn0.54Fe2.46O4 in M1. Previous studies of magnetic characterization observed a little hysteresis of this equimolar ZF. The results of estimation of the band gap energy (Eg) via the manipulation of the Kubelka-Munk theory allowed to determine that the samples M1, M2, M3 and M4 are considered semiconductors (3.66 and 3.76 eV).


About Author :
⁣Doctor and Master Science in Materials Engineering and Metallurgy by Pontifical Catholic University of Rio de Janeiro- Brazil. Now is a Senior Researcher Professor at Materials Science and Metallurgical Engineering Department of College of Geological, Mining and Metallurgical Engineering - FIGMM of the National University of Engineering-UNI and Chief of Ironmaking and Steelmaking Researcher Group FIGMM UNI. Prof. Gomez-Marroquin is the founding partner and the first president of the board of directors of Metallurgy, Materials and Minerals Peruvian Association-APMMM. Today, she is working in characterizations of different nature biomass such as biochar from olive stone and chicken eggshell for recovering heavy metals from mining wastes. Has been working on the following subjects: recovering metals of Linz Donawitz sludge (LDS), Electric Arc Furnace Dusts (EAFD), and Basic Oxygen Furnace (BOF) using techniques of selfreduction and carbothermic reduction. Also, she had worked in reduction by CO-CO2 mixtures gases of zinc ferrite pure and zinc ferrite present into Electric Arc Furnace Dusts - EAFD using different techniques as such: X-Ray Diffraction (using the Rietveld method), Transmission Electron Microscopy and Scanning Electron Microscopy. About ZF pure and present into EAFD, she has researches that had been onsets with the characterization of the compounds present in EAFD - Iron (III) oxide, zinc oxide & zinc ferrite - using techniques, methodologies, and equipment for thermal characterization (DTA-TGA), structural (XRD), microscopic (SEM-TEM coupled to EDS), physical (briquette porosity, specific gravity, average size & particle specific surface) and chemical analysis by Absorption Atomic and Fluorescence Spectrometer.