Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite

Abstract : The K-birnessite (KxMnO2·yH2O) reduction reaction has been tested in order to obtain manganese spinel nanoparticles. The addition of 0.25 weight percent of hydrazine hydrate, the reducing agent, during 24 hours is efficient to transform the birnessite powder in a hausmanite Mn3O4 powder. Well crystallised square shape nanoparticles are obtained. Different birnessite precursors have been tested and the reaction kinetics is strongly correlated to the crystallinity and granulometry of the precursor. The effects of aging time and hydrazine hydrate amount have been studied. Well crystallised Mn3O4 is obtained in one hour. The presence of feitknechtite (MnO(OH)) and amorphous nanorods has been detected as an intermediate phase during birnessite conversion into hausmanite. The conversion mechanism is discussed.
Type de document :
Article dans une revue
Liste complète des métadonnées
Contributeur : Maxime Haldric Connectez-vous pour contacter le contributeur
Soumis le : mardi 31 août 2010 - 11:42:07
Dernière modification le : lundi 11 octobre 2021 - 13:02:02




Fabien Giovannelli, T. Chartier, Cécile Autret-Lambert, Fabian Delorme, Mustapha Zaghrioui, et al.. A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite. Journal of Solid State Chemistry, Elsevier, 2009, 182 (5), p. 1021-1026. ⟨10.1016/j.jssc.2009.01.031⟩. ⟨hal-00512691⟩



Consultations de la notice