1. Aco Janicijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Srbija, Serbia
Activation time dependent magnetization of the Fe/BaTiO3 system with varying constituent mass ratios
N. Stojanović1, S. Divac1, A. Kalezić-Glišović1, A. Janićijević2, A. Maričić1
1Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Materials, Faculty of Technical Sciences Čačak, University of Kragujevac, Svetog Save 65, 32 000 Čačak, Serbia
2Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia
Powdery mixtures of Fe and BaTiO3 with mass ratios of 10% Fe, 20% Fe, 30% Fe, 50% Fe, 60% Fe and 70% Fe were activated in a planetary ball mill for times ranging form 30 min to 300 min. Activated powders were pressed, then sintered at 1200 oC for two hours.
Depending on the activation time, the system changes its chemical composition. It has been experimentally observed that the magnetization of sintered samples rises with the increase of iron in the initial powders.
For each sample, two measurements of the magnetization dependency on the activation time were made: the first measurement at room temperature and the second measurement after the heating to Curie temperature and subsequent cooling in the applied magnetic field of 50 kA/m. The most pronounced ferroelectric change after cooling was observed at 120 °C for the sintered sample of 70 mass% Fe and 30 mass% BaTiO3 activated for 120 min, with the magnetization value of 18,10 Am2/kg - a 51% net increase compared to the one obtained at room temperature before the heating.
Further increase of the activation time of initial powders leads to a decrease of magnetization of all sintered samples.