Abstract
Isolated tungsten nanoparticles(α-W andβ-W phase) weresynthesized and epitaxially grown on alumina and spinel particle surfaces with an average tungsten size of≤20 nm for a lowtungsten content (of ≤1.5 vol%). Using tungsten (VI) ethoxide alcoholic solutions, tungsten trioxide hydratedprecursors were attached to a ceramic grains surface as a nanoparticle coating.High-resolution transmission electron microscopy (HRTEM) micrographs showed epitaxialinterfaces between alumina, spinel and metallic tungsten. This epitaxial growth is assumedto be due to the effect of water vapour on the sublimation of ortho-tungstic acid during thereduction process in a hydrogen atmosphere. The planes involved in the epitaxy were foundto be and .
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