Fabrication of (Ba_(1-x)Sr_x)(Zr_xTi _(1-x))O_3 ceramics prepared using the combustion technique

摘要

Barium strontium zirconate titanate ((Ba_(1-x) Sr_x)(Zr_x Ti_(1-x))O_3; BSZT, x = 0.25 and 0.75) ceramics with a highly crystalline structure were successfully synthesized using the combustion technique, in which urea performed an important role. The effect of calcination (1000-1300 °C) and sintering temperatures (1300-1550 °C) on the phase formation and microstructure of BSZT ceramics were investigated. The pure perovskite phase of BSZT (x = 0.25 and 0.75) powders with a uniform cubic morphology were detected at the calcination temperature of 1300 °C. At the same calcination and sintering temperature, the lattice parameter a of BSZT powder and ceramics with x = 0.75 is higher than x = 0.25. The microstructure of BSZT powders exhibited an almost-spherical morphology and had a porous agglomerated form. The average particle size and the average grain size of all ceramics increased with the increase of calcination and sintering temperatures, but decreased when the content of x increased. The maximum densities of x = 0.25 and 0.75 ceramics were around 5.85 and 5.62 g cm~(-3) obtained from the samples sintered at 1500 and 1450 °C, respectively.