Effects of Calcination Temperatures on Phase and Morphology Evolution of (Ba_(0.25)Sr_(0.75))(Zr_(0.75)Ti_(0.25))O_3 Powders Synthesized via Solid-State Reaction and Combustion Technique

摘要

The effect of calcination temperatures (1000-1400°C) on the phase formation and microstructure of barium strontium zirconate titanate [(Ba_(0.25)Sr_(0.75))(Zr_(0.75)Ti_(0.25))O_3; BSZT] powders were investigated. BSZT powders were prepared and compared by the solid state reaction method and the combustion technique. The higher calcination temperatures increased the percentage of the perovskite phase, but decreased the lattice parameter a. The same crystallographic pure perovskite phase of BSZT powders, which were prepared via the combustion technique were detected above 1300°C; which was lower than the calcinations temperature of mixed oxide method by 50°C. The TGA-DTA results corresponded to XRD investigation. The microstructure of BSZT powders, which were prepared using both techniques, exhibited an almost-spherical morphology and had a porous agglomerated form. The average particle sizes of BSZT powders prepared via the combustion technique (0.13-0.30μm) and the solid state reaction method (0.18-0.38μm) were increased with the increase of calcinations temperatures.