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Journal Articles Journal of Materials Research Year : 2019

Water dissociation on the low-coordinated sites of MgO nanopowders

Abstract

The configurations associated with the dissociative adsorption of water on a variety of low-coordinated sites of MgO(100) surfaces, including corners, steps, MgO vacancies and kinks on <010> steps have been studied and assigned by combining infrared spectroscopy and ab initio calculations. Three kinds of MgO powders were examined, powders of very high specific surface area prepared by chemical vapor synthesis and well-defined cubic smoke particles obtained by combustion either in 20:80 or 60:40 O2:Ar mixtures, the latter one involving less defects and smaller particles. It appears that an imperative requirement to obtain a precise characterization of the reactive behavior of defects is to keep the samples in ultra-high vacuum conditions and to control the water partial pressure finely.
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Dates and versions

hal-02400798 , version 1 (09-12-2019)

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Fabio Finocchi, Francia Haque, Stephane Chenot, Jacques Jupille, Slavica Stankic. Water dissociation on the low-coordinated sites of MgO nanopowders. Journal of Materials Research, 2019, 34 (3), pp.408-415. ⟨10.1557/jmr.2018.461⟩. ⟨hal-02400798⟩
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