The invention is directed to a body comprising oxides of lanthanides, in particular holmium oxide (Ho2O3), which are supported on a sulphur containing carbon based particle and to a process for producing said body.L'invention concerne un corps comprenant des oxydes de lanthanides, en particulier de l'oxyde d'holmium (Ho2O3), qui sont supportés sur une particule à base de carbone contenant du soufre, et un procédé de production dudit corps.
