Abstract
Abstract Synthesis of complex oxides requires high temperatures to overcome barriers due to the diffusion of solids. Therefore, the most stable polymorphs are obtained in general reactions. However, it is necessary to design kinetic reactions with low initial energy barriers and control the reaction path and products to synthesize novel and metastable oxides. We report the synthesis of a metastable Fe2GeO5 with a kyanite-type structure via kinetic control of oxidative reaction in Fe2GeO4. It is also found that Fe2GeO5 was not synthesized at all by the conventional method, high-pressure synthesis method, or coprecipitation method. Our result indicates that kinetic control of the oxidative reaction is a promising method for synthesizing metastable materials.
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