Nanocrystalline yttria was prepared by mechanical processing. A fraction was annealed in air at 473 K. Annealed and non-annealed powders were treated in Ar at temperatures between 700 and 1000 K, which induced a parabolic grain growth kinetics with an Arrhenius-like dependence on temperature. Grain growth is significantly slower in annealed powders with respect to non-annealed ones. This is related to oxygen chemical absorption during annealing in air and the consequent decrease of oxygen vacancies originally present in powders.

Nanocrystalline yttria: Grain growth depression by thermal annealing in air / Garroni, Sebastiano; Orrù, Roberto; Delogu, Francesco; Cao, Giacomo. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 104:(2015), pp. 33-36. [10.1016/j.scriptamat.2015.04.002]

Nanocrystalline yttria: Grain growth depression by thermal annealing in air

GARRONI, Sebastiano;
2015

Abstract

Nanocrystalline yttria was prepared by mechanical processing. A fraction was annealed in air at 473 K. Annealed and non-annealed powders were treated in Ar at temperatures between 700 and 1000 K, which induced a parabolic grain growth kinetics with an Arrhenius-like dependence on temperature. Grain growth is significantly slower in annealed powders with respect to non-annealed ones. This is related to oxygen chemical absorption during annealing in air and the consequent decrease of oxygen vacancies originally present in powders.
Nanocrystalline yttria: Grain growth depression by thermal annealing in air / Garroni, Sebastiano; Orrù, Roberto; Delogu, Francesco; Cao, Giacomo. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 104:(2015), pp. 33-36. [10.1016/j.scriptamat.2015.04.002]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/172079
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