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X-ray diffraction is described by the Rietveld method in Na1/2Bi1/2TiO3-based solid solutions. Stability of ferroelectric state and coexistence of phases with different symmetry is determined in the region of structural phase transition.

Local symmetry is determined in Na1/2Bi1/2TiO3- BaTiO3 solid solutions, using Raman scattering measurements.

Nature of electrocaloric effect is described in connection with various mechanisms of polarization in relaxor ferroelectrics.

Phase diagram and nature of phase transition are determined for Na1/2Bi1/2TiO3-BaTiO3-Na1-xKxNbO3 solid solutions.

New solid solutions Na1/2Bi1/2TiO3-SrTiO3-PbTiO3-CaTiO3 are synthesized. Dielectric properties and electrocaloric effect are studied for these compositions. Local environment of Ca in crystalline lattice and its role in development of relaxor state are considered.