Influence of mechanical activation on structural and electrical properties of sintered MgTiO3 ceramics

The aim of this work was to analyze the influence of mechanical activation on the MgCO3-TiO2 system. Mixtures of MgCO3-TiO2 were mechanically activated for 15, 30, 60 and 120 minutes in a planetary ball mill and after that sintered at 1100°C for 1h. XRD analyses were performed in order to give information about the phase composition and to determine a variety of microstructure parameters using Scherrer's method. Also, the effect of tribophysical activation and sintering process on microstructure was investigated by scanning electron microscopy. Electrical measurements were performed in order to determine electrical properties of sintered samples. Our conclusions are that the sample activated for 120 min showed the best electrical properties ( ε r=23.86, Q=233, ρ=0.38) and exhibited the best sinterability.Cilj ovog rada bio je analiza uticaja mehaničke aktivacije na sistem MgCO3-TiO2. Smeše MgCO3-TiO2 su mehanički aktivirane u planetarnom mlinu sa kuglama u trajanju od 15, 30, 60 i 120 minuta i nakon toga sinterovane na 1100°C 1h. Radi utvrđivanja faznog sastava i promena mikrostrukturnih parametara, Šererovom metodom, urađena je rendgeno-difrakciona analiza. Efekti mehaničke aktivacije i procesa sinterovanja na mikrostrukturu ispitivani su skenirajućom elektronskom mikroskopijom. U cilju određivanja električnih svojstava sinteroanih uzoraka izvršena su električna merenja. Zaključak našeg rada je da uzorak sinterovan 120 minuta pokazuje najbolja električna svojstva (ε r=23,86; Q=233; ρ=0,38) i ispoljava najbolju sinterabilnost