Ionic conductivity of BaFCl

Abstract

Abstract The ionic conductivity of undoped and doped BaFCl single crystals is measured. In BaFCl, the measurements are performed parallel and perpendicular to the crystallographic c ‐axis. Incorporation of monovalent impurities (Tl, Na) enhances the conductivity while it decreases by doping with trivalent impurities (Gd). The results indicate that BaFCl has anionic conduction via halide ion vacancies and that the thermally generated lattice defects are of Schottky type. The probable mechanism for the conduction process in these crystals is discussed on the basis of structural considerations of the unit cell.