YAG Preparation And Its XRD Structure Analysis By Rietveld Method

Yttrium aluminum garnet (Y3Al5O12, YAG) is not only a very important laser material, but also a high-temperature structural material and a fluorescence material. In this paper, the discussions are mainly focused on the synthesis of YAG powders by co-precipitation method, Self-Propagating High-temperature Synthesis and mixed method, powder's property, etc.In the co-precipitation method, the precursor was produced by adding a mixed A1(NO3)3 and Y(NO3)3 solution to NH4HCO3 solution. YAG can be obtained by heating the precursor at lOOO'C for 5 hours without the formation of YAM and YAP transition phase.YAG powder was prepared by Self-Propagating High-temperature Synthesis method. By co-melting the mixture solution of A1(NO3)3 and Y(NO3)3 with electric cooker. When the mole proportion of metal ion and urea were 1/3 and 1/4, the nano-YAG can be obtained with particle size of 46nm and52 nm. The Xrd and Ft-Ir patterns show that the powder was transformed from amorphous to crystalline state with the increasing of urea.Synthesis of Ca, Ca: YAG powder by the mixed method was investigated. Weight up Y2O3 and AI2O3 with the mole proportion of 3/5. After sufficient grinding, we got the round pieces of F 20mm and thickness 5mm with 30Mpa pressure. Then sinter the pieces in the hydrogen atmosphere at 1700癈 for 5 hours. After sufficient grinding, the powders were annealed in the Oxygen atmosphere at 1100'C for 10 hours. The XRD dates were refined by Rietveld method of whole pattern fitting by using the computer progress of DBWS-9411, and then the exact Crystal Structures were got.