Influence of isomorphous substitution of metal ion on the low-frequency dielectric dispersion in NH2(CH3)(2)Al1-xCrx(SO4)(2)center dot 6H(2)O ferroelectrics

摘要

This paper is devoted to the study of the influence of metal ion isomorphous substitution on the ferroelastic-ferroelectric phase transition and dispersion caused by the motion of domain walls in dimethylammonium metal sulfate hexahydrate DMAAl(1-x)Cr(x)S ferroelectric crystals (x = 0, 0.065, 0.2). It is shown that such a substitution significantly changes the phase transition temperature and parameters of the dielectric dispersion. These changes are explained in terms of interaction between the metal-hydrate complexes and DMA groups that carry the dipole moment and due to this they are responsible for the phase transitions and motion of the domain walls.