Mechanical synthesis of nanostructured Y2Ti2O7 pyrochlore oxides

Abstract : Pyrochlore-type Y2Ti2O7 powders were successfully synthesized by mechanical milling. Nanosized powders of Y2O3 and TiO2 are milled to form an amorphous mixture of Y2Ti2O7 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 degrees 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 degrees C. The formation of the pyrochlore structure occurs around 900 degrees 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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Submitted on : Tuesday, December 4, 2018 - 10:45:20 AM
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E. Simondon, P-F Giroux, L. Chaffron, A. Fitch, P. Castany, et al.. Mechanical synthesis of nanostructured Y2Ti2O7 pyrochlore oxides. Solid State Sciences, Elsevier, 2018, 85, pp.54-59. ⟨10.1016/j.solidstatesciences.2018.09.006⟩. ⟨hal-01935361⟩

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