Molecular Crystals and Liquid Crystals, Vol.699, No.1, 111-118, 2020
Phenomena induced by UV irradiation in PbMoO(4)single crystal
Electrical properties and optical absorption of PbMoO(4)single crystal were studied after UV irradiation. Anomalies of permittivity epsilon and conductivity sigma were detected and attributed to the dipole centers induced by UV light. It was proposed that dipole centers were created by photoelectrons trapped by Mo within oxygen tetrahedra distorted by an oxygen vacancy V-O. At high temperatures conductivity was nearly insensitive to UV irradiation. Additional optical absorption was observed in PbMoO(4)single crystal after UV irradiation. It was argued that transfer of photoelectrons from lead to molybdenum groups was responsible for the photochromic effect found.