Funct. Mater. 2020; 27 (2): 252-257.
Photopolarization of undoped and gallium doped crystals of silicosillenites
1O. Honchar Dnipro National University, 72 Gagarin Ave., 49010 Dnipro, Ukraine
2Ukrainian State University of Chemical Technology, 8 Gagarin Ave., 49005 Dnipro, Ukraine
The effect of visible light on polarization processes in undoped and gallium doped crystals of silicosillenites (Bi12SiO20 and Bi12SiO20:Ga) was studied using thermoactivation, photo- and dielectric spectroscopy in the temperature range of 300 to 800 K. The temperature dependences of the current of thermally stimulated depolarization and dielectric permitivity, polarization charge, and dielectric hysteresis loops under different polarization conditions are obtained, and the mechanisms of space-charge and quasi-dipole polarization are identified.
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