Bulk ionic conductivity, Ionic Thermal Current (I.T.C.), and Thermally Stimulated Polarization Current (T.S.P.C.) studies are reported for the system Bal-,LaXF2+, (0.12 x loe2 < x < 0.45). The obtained results are illustrative for the compositional dependence of the ionic conductivity of anion-excess solid solutions. For small solute content simple associates as well as free mobile fluoride interstitials are present. For x > 0.01 defect clusters form. The ionic conductivity in this concentration range is characterized by Enhanced Ionic Motion.
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