Ultrasonic Assisted Synthesis and Characterization of Yttrium Aluminum Garnet (YAG) Powders

Yttrium aluminum garnet (YAG) precursors were synthesized by co-precipitation method assisted by high power intermittent ultrasonic with high initial reactant concentration (2.0 mol/L). Yttrium aluminum garnet began to crystallize when calcinated for 2 h at relatively low temperature (800 degrees C) without the appearance of such intermediate phase as YAP and YAM. Rietveld refinement software GASA was used to refine the structural parameters and size information. TG/DTA, FT-IR methods were used to characterize the composition and thermal stability of the precursors. SEM/EDS measurements revealed the coating structure of two components in precursors and the morphology of YAG being flakes with 200-300 nm long and 60-70 nm wide agglomerated by 60-70 nm YAG grain in the case of YAG precursor calcinated for 2 h at 1100 degrees C.