Reaction Kinetics of Polycrystalline Yttrium Iron Garnet

Abstract

The formation of yttrium iron garnet, Y 3 Fe 2 ‐(FeO 4 ) 3 , starting with (1) Fe 2 O 3 and Y 2 O 3 and (2) Fe 3 O 4 and Y 2 O 3 , 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.