An examination was made, in the mean-field approximation, of phase transitions in an elasto-isotropic cubic ferroelectric crystal containing randomly distributed ring dislocations. It was found that a transition to a dipole-glass phase with chaotic spontaneous unit-cell dipole moments, and characterized by the Edwards-Anderson non-local parameter, preceded the transition to the ferroelectric phase.

The Intermediate Glassy Phase in a Ferroelectric with Dislocations. P.N.Timonin: Zhurnal Eksp. Teor. Fiz., 1999, 116[3], 986-1000 (JETP, 1999, 89[3], 525-32)