Various forms of multiferroic compounds (powder, dense ceramics, thin films) have attracted a high interest in both fundamental and applied research owing to their application possibilities. They enable the change of the magnetic ground state with voltage only (without loss of energy) and reading of the state using spintronic microdevices. The project itself comprises detailed studies of peculiarities of the chemical composition, atomic and magnetic structures, structural phase transitions, physico-chemical properties, and their interrelationships. One of the main aims of the project is the development of empirical criteria for the search and preparation of new advanced multiferroic materials.