Effects of B<inf>2</inf>O<inf>3</inf> addition on the sintering behavior of 0-5-10% ZrO<inf>2</inf> doped BaTiO<inf>3</inf> based ceramics

Abstract

In this study, the effect of B<inf>2</inf>O<inf>3</inf> addition on the sintering behavior of 0-5-10% ZrO<inf>2</inf> doped barium titanate based microwave dielectric ceramics were investigated. For this purpose, the powder mixtures consisting of BaCO<inf>3</inf>, TiO<inf>2</inf> and ZrO<inf>2</inf> were prepared by ball milling technique in alcohol using ZrO<inf>2</inf> balls at 200 cycle/min for 20 h. The prepared powders were calcined at 900°C for 2 h. Produced powders were mixed 0.5% B<inf>2</inf>O<inf>3</inf> and 5% PVA and pressed as green body under the pressure of 100 MPa. The disc-shaped die-pressed samples were sintered at 1250 °C, 1350 °C and 1450 °C for 4 h. X-ray diffraction analysis showed that the main phases formed in the sintered samples are BaTi)<inf>3</inf> and Ba(Ti<inf>1-x</inf>Zr<inf>x</inf>)O<inf>3</inf>. The scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to investigate microstructure of the sintered samples. The bulk densities of the sintered samples increased with the addition of B<inf>2</inf>O<inf>3</inf> content due to the low number of pores trapped between the grains.