Ionic motion and conduction in (1 -x )PbF 2 · x ZrF 4 and (1 -x )PbF 2 · x MF (M = alkali-metal cation) solid solutions are studied by 19 F and 207 Pb NMR and impedance spectroscopy. The factors determining ionic motion in the solid solutions and their structure and energetics in the range 170-550 K are analyzed. The ionic conductivity of (1 − x )PbF 2 · x ZrF 4 with x ≤ 0.4 and 0.93PbF 2 · 0.07MF is shown to be 10 -4 to 10 -2 S/cm at temperatures above 425 K, which places these materials among superionics.
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