ИСТИНА

Structure of Pr(1-x)CaxMnO3 (x=0.33; 0.4)has an orthorhombic Pdnm space group. It is known that in Pr(1-x)CaxMnO3 the ferromagnetic metallic phase is absent.In the concentration rangg 0.3 < x < 0.5 an ingomogeneous magnetic insulating stste takes place.In this case the ferromagnetic phase coexists with the charge- and orbital-ordered antiferromagnetic phase of CE-type. The latter phase is own structure which described by the P2_1nm space group without inversion center. Spontaneous generation of voltage (SGV) has been detected in the temperature range 80-300 K. We consider the possible mechanisms of SGV emergence and their connection with crystal structure properties.