A general combined hydrothermal and annealing process for the fabrication of ferrite/perovskite oxide core/shell nanostructures was introduced. The coating of a perovskite oxide (ABO 3 ) layer on spherical ferrite particles was performed in two steps. A dense and smooth amorphous layer containing B-site ions of the perovskite oxide was coated first via a controlled hydrolysis and aging process. During hydrothermal treatment and subsequent annealing process, the A-site ions were incorporated in situ into the as-coated amorphous layer preserving the spherical morphology. This synthesis of ferrite/ perovskite oxide core/shell nanostructures was demonstrated in systems like Fe

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