Abstract
In addition to the traditional mechanisms of sintering, such as migration and coalescence of the crystallites and global or local ripening, mechanisms involving wetting and spreading can also be relevant. In an oxygen atmosphere, both the small and the large crystallites emit patches of multilayer films. These patches can coalesce to generate a contiguous film among a large number of crystallites. During subsequent heating in hydrogen, the films are reduced and rupture, generating patches surrounding existing particles (with which they finally coalesce), or independent patches that contract generating particles in places initially free of particles. Thermodynamic considerations are employed to explain why films form during heating in an oxygen atmosphere and why they rupture during heating in a hydrogen atmosphere.
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