Eur. Phys. J. AP
Volume 9, Number 3, March 2000
|Page(s)||205 - 213|
|Published online||15 March 2000|
Formation of rare earth hydroxide nanotubes and whiskers as corrosion product of LaNi5-type alloys in aqueous KOH
Centre d'Études de Chimie Métallurgique, CNRS, 15 rue G. Urbain, 94407 Vitry-sur-Seine, France
2 SAFT, Direction de la Recherche, route de Nozay, 91460 Marcoussis, France
Corresponding author: email@example.com
Revised: 18 November 1999
Accepted: 23 November 1999
Published online: 15 March 2000
Mm(OH)3 (Mm = mischmetal) single crystalline needles with  growth axis form upon exposure of MmNi5-substituted alloys to aqueous KOH. Crystal structure, chemical composition and morphology of the needles are studied by means of scanning electron microscopy and quantitative transmission electron microscopy. The needles can be either solid (whiskers) or hollow (nanotubes). Their morphology and growth kinetics are studied as a function of immersion temperature, stirring rate of the aqueous KOH electrolyte and presence of tracer. Based on the observations, a model mechanism is developed for their growth.
PACS: 61.46.+w – Clusters, nanoparticules, and nanocrystalline materials / 61.72.-y – Defects and impurities in crystals; microstructure / 61.16.Bg – Transmission, reflection and scanning electron microscopy (including EBIC)
© EDP Sciences, 2000
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