Reaction Kinetics of Polycrystalline Yttrium Iron Garnet

The formation of yttrium iron garnet, Y3Fe2-(FeO4)3, starting with (1) Fe2O3 and Y2O3 and (2) Fe3O4 and Y2O3, was studied as a function of temperature and time by means of magnetic moment and X-ray measurements. The reaction began at 600°C. and was completed at 1200°C. The perovskite phase appeared only between 600° and 800°C. Above 1200°C. only the garnet phase was present. The microwave line width and g-factor at 9303 mc. per second were also measured and related to the preparation variables.