DEFECT DIPOLE RELAXATION IN POLYCRYSTALLINE DOLOMITE [CAMG(CO3)(2)]

The thermally stimulated depolarization current or ionic thermocurrent technique detects two low-temperature bands with maxima at 140 and 18 8 K, respectively. The choice of proper polarizing conditions, to inhi bit the formation of space-charge polarization, permits the accurate s tudy of the low-temperature mechanisms. The extensive dielectric chara cterization shows that the relaxation mechanisms are related to homoge neous polarization processes and most likely originate from dipolar ce nters. The thermal treatments indicate that the centers are probably d efect dipole agglomerates. The energy parameters for dielectric relaxa tion are also evaluated.