Ingeniería de oxígeno y resolución atómicaherramientas ineludibles para el estudio de nuevos óxidos en el sistema Ca2Mn3O8-d

Abstract

The unusual interest provoked by mixed manganese oxides is mainly due to the enormous capability of this transition element to adopt different oxidation states and coordination environments, which has led to the development of a wide range of technological devices based on a broad functional behaviour. The modification of the manganese oxidation state allows to modify, among others, its transport and catalytic properties. The variation of its coordination environment allows to stabilize structures with a more or less complex anion sublattice. Moreover, the cation occupying the holes generated by the [MnOx] polyhedra plays a crucial role in the stability of a given structural type. This compositional and structural richness has shown itself in all its magnificence in the last quarter of a century by exploiting the redox behaviour of these systems, not only through its known catalytic activity in the selective oxidation of some hydrocarbons and, in general, in oxidation processes of organic compounds, but also by its widely studied magnetic behaviour, particularly analyzed in mixed manganese oxides with colossal magnetoresistance...