Effect of the Synthesis Method on the Properties of Uitrafine YAG Powder

摘要

Yttrium aluminum garnet (YAG) materials have a number of unique properties, such that its application is extensive. In this study, uitrafine YAG powder materials were prepared by coprecipitation and hydrothermal precipitation methods. The influence of the synthesis process on the morphology of the powder was investigated. Results showed that the precursor powder prepared via the coprecipitation method mainly undergoes amorphous to crystalline transition with the increase in calcination temperature and that the precursor agglomeration is severe. In the process of increasing the calcination temperature, the dispersibility of the roasted powder is considerably improved, which is favorable for the growth of the crystal grains, such that the particle size of the powder is gradually increased. The YAG precursor prepared by the coprecipitation method is transformed into YAG crystals, with the phase transition mainly occurring between 900 °C and 1,100 °C. When the molar ratio of salt to alkali is Y~(3+)/OH~-=1:8 via the hydrothermal reaction, YAG particles with homogeneous morphology can be obtained. When the molar ratio of salt to alkali is continuously increased, the morphology of YAG particles is not obviously changed. The coprecipitation method is used to control the particle size, whereas the hydrothermal method is used to control the particle morphology.