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The crystal structure of complex oxide ferroelectrics Ba 4 Sm 2 Fe 2 Nb 8 O 30  and Ba 4 Gd 2 Fe 2 Nb 8 O 30  have been studied by means of energy-dispersive X-ray diffraction method at high pressure up to 4 GPa at room temperature. At ambient pressure, the crystal structure of both compounds is described by the tetragonal symmetry with space group  P4 / mbm . At pressure  P∼ 1.8 GPa in Ba 4 Sm 2 Fe 2 Nb 8 O 30  and at  P∼ 2.2 GPa in Ba 4 Gd 2 Fe 2 Nb 8 O 30  the structure phase transition have been observed. The orthorhombic structure model with  Pba 2 space group for high-pressure phase of those compounds have been proposed. The baric dependences of lattice parameters and unit cell volumes of Ba 4 Sm 2 Fe 2 Nb 8 O 30  and Ba 4 Gd 2 Fe 2 Nb 8 O 30  compounds have been obtained.

The pressure effect on crystal structure of complex ferroelectrics Ba 4 Sm 2 Fe 2 Nb 8 O 30 and Ba 4 Gd 2 Fe 2 Nb 8 O 30