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Article Dans Une Revue Oxidation of Metals Année : 2016

Duplex n- and p-Type Chromia Grown on Pure Chromium: A Photoelectrochemical and Microscopic Study

Résumé

Chromia grown on pure chromium at 900 A degrees C for 30 min at an oxygen partial pressure p(O-2) of 10(-12) atm has been characterized using photoelectrochemical and electron microscopy techniques. This study reveals a duplex scale: n-chromia with equiaxis morphology in the internal part (similar to 650 nm thick) and p-chromia with columnar morphology in the external part (similar to 900 nm thick). Grain orientation maps also revealed the presence of a c-oriented chromia layer at the interface between the n- and the p-subscales. This aOE (c) 0001 > textured layer was identified as the first-grown chromia layer. It means that internal n-equiaxis chromia grew by anionic transport governed by oxygen vacancy diffusion, whereas external p-columnar chromia layer grew outwards and was controlled by chromium vacancy diffusion.

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Matériaux
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Dates et versions

hal-01451270 , version 1 (31-01-2017)

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L. Latu-Romain, Y. Parsa, S. Mathieu, M. Vilasi, M. Ollivier, et al.. Duplex n- and p-Type Chromia Grown on Pure Chromium: A Photoelectrochemical and Microscopic Study. Oxidation of Metals, 2016, 86 (5-6), pp.497 - 509. ⟨10.1007/s11085-016-9648-6⟩. ⟨hal-01451270⟩
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