<p>Preparation and study of oxides with interesting magnetic, optical and electronic properties and their correaltion to the structure and the nanosize. 1) structure-properties correlation: the structural repercussion of a high covalency of themetal-oxygen bond; effect of the charge disproportionation; 2) study of the metal-insulator transitions in oxides with strong electronic correlation; 3) comprehension of the magnetic coupling mechanisms and transport in magnetoresistive materials; 5) study of the ordered magnetic structures and charge ordering phenomena in mixed-valence systems; 6) Understanding multiferroism: unveiling the mechanisms of magnetic-electric coupling.</p>