Preparation of polycrystalline rare earth orthoferrites and garnets via hydroxide precipitation

Rare earth orthoferrites and garnets were both prepared by heat treating coprecipitated hydroxides of the rare earth ion and Fe³⁺. X-ray and electron diffraction as well as Mössbauer measurements indicate that the transition from amorphous solid solution to crystalline orthoferrites takes place between 600° and 700°C. Crystalline garnet forms when the amorphous mixture is heated above 700°C. The formation of the orthoferrites and garnet occurs directly without role=presentation style=font-size: 90%; display: inline-block; position: relative;>$\text{without}$$\text{without}$ prior formation of component oxides.