Abstract
Dielectric permittivity of pure and doped with copper lead germanate Pb5Ge3O11 (PGO) crystal was studied in wide frequency (20 Hz to 3 GHz) and temperature (120 K to 450 K) range. The ferroelectric phase transition in PGO crystals is mixed “order-disoder” and displacive. Second order phase transition temperature shifts to lower temperature with increase the concentration of Cu2+ dopant. At low temperatures the dielectric relaxation caused by off center Cu2+ ion dynamics was detected. Dielectric dispersion in PGO:Cu crystals is attributed to domain wall dynamics and dipole glass freezing. It is shown that the domain relaxation requires lower energy then for the random freezing dipoles.
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