Low-temperature fabrication of polycrystalline yttrium aluminum garnet ir,k; powder via a mechanochemical solid reaction of nanocrystalline yttria with transition

摘要

Mechanical processing of nanocrystalline Y_20_3 and transition alumina (AIOOH) was performed, using a Spex mixer mill under atmospheric conditions, to synthesize yttrium aluminum garnet (YAG, Y_3A1_50_(12)) powder at lower temperature. The reaction of nanocrystalline Y_20_3 with AIOOH was activated by mechanical energy and use of fine instead of heat energy, leading to the direct formation of pure YAG without second phases at a lower temperature, 800°C, which is significantly lower than that required by the conventional solidstate reaction process.