Abstract: Polycrystalline nano-sized powders of aluminium yttrium garnet (YAG) were synthesized by a mixed
solvo-thermal method at low temperature(300℃) and low pressure (10MPa). The phase transformation, composition and micro-structural features
of the final products were characterized by X-ray powder diffraction, IR, BET, and TEM techniques. X-ray powder diffraction patterns indicated that pure
phase YAG powder was synthesized in the mixed solvent at lower temperature. The transmission electron microscopy (TEM) revealed the averaged size of
crystallite was 20nm and well dispersed. The mechanism of YAG formation in the hydrothermal condition was investigated based on the results.

Key words: yttrium aluminium garnet, nano-sized powder, solvo-thermal method