Balasmeh Z. Photodielectric effect in lead molybdate PbMoO4.

Object - Monocrystals lead molybdate (PbMo4 ) with a different deviation from stoichiometry, which were reared from fusion by the Czochralski method. A purpose - is researches of electric conductivity, photoconductivity and dielectric permittivity at the crystals of lead molybdate for establishment of mechanism of transfer of charges. Subject - Influence of external factors on the electrical properties of monocrystal PbMo4. Methods - Dielectric spectroscopy at low measured frequencies and volt-ampere descriptions in the mode of the currents limited by a volume charges. The hopping mechanism of transfer of charges is set. Thus jumps take place on extensive clusters which are the chains of defects of crystalline lattice. The exposed influence of illumination on dielectric permittivity of lead molybdate and set basic to conformity to the law conducts of dielectric permittivity depending on the terms of experiment. This photodielectric effect (PDE) in the crystals of difficult oxides was take place at first. It is shown, that FDE and photoconductivity are related to one and another as direct cause and effect, as it takes place for many semiconductors. The change of dielectric properties of lead molybdate under influencing of long irradiation by ultraviolet light is first exposed. A model, which settles no conflicting to account for the basic phenomena which are observed in the crystals of lead molybdate at the change of temperature and at illumination, is offered.