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Pyrochlore-type Y 2 Ti 2 O 7 powders were synthesized by mechanical milling. Nanosized powders of Y 2 O 3 and TiO 2 are milled to form an amorphous mixture of Y 2 Ti 2 O 7 containing a small quantity of crystallized fluorite structure and initial constituents. The desired fully crystallized pyrochlore phase is obtained from this mixture through heat treating at 900°C. In situ X-ray Diffraction by Synchrotron radiation investigations reveal that this transformation takes pace through a first step of crystallization into a fluorite-like structure at 800°C. The formation of the pyrochlore structure occurs around 900°C. The obtained product is a nanostructured pyrochlore powder of which can be integrated in the manufacturing process of oxide dispersion strengthened steels.

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