Moving of Fluorine Ions under Dynamic Elastic Deformation in LaF3 Crystals

Abstract

Using simulation, we studied the features of fluorine ion movement in a superionic lanthanum trifluoride crystal in the dielectric phase under dynamic elastic deformation caused by the propagation of an acoustic wave with a frequency of no more than 100 MHz. It was found that the concentration of fluorine ions in interstitial positions increases significantly in the tensile region and decreases slightly in the compression region. In the tensile and compressive zones, alternating at intervals equal to the half-length of the acoustic wave, the ionic conductivity can differ by an order of magnitude, forming localized regions of the superionic phase.