The formation mechanism of electret properties in dispersed media based on LiF crystals

Abstract

Studies of the process of electret charge generation in LiF crystals subjected to mechanical activation and evaluation of the role of color centers in this process were carried out. Accumulation of currents in the studied material in absence of external voltage is connected with electrical activity of the system and the generation of a stable internal electric field in this system. The electric field generated in a heterogeneous medium formed by fine-dispersed lithium fluoride and a water film, causes ionization of polar water molecules that produce conductivity channels. This leads to active electrical interaction of the surfaces of solid and liquid dielectrics included in structure of the system under study. The presence of radiation induced defects in the dispersed phase based on LiF influences the processes of interphase interactions. This contributes to formation of deep electron traps and increases the lifetime of the charge of electrets.