Abstract
19F wide-line and pulsed NMR study of fluorite-type Pb 3ZrF 10 point to the presence of two kinds of fluorine atoms of different mobility. At low temperature only one is mobile with a weakly activated short-range motion (0.14 eV). Above 220 K all fluorine atoms become mobile; the exchange between both types of atoms leads to 1-D conduction with a higher activation energy (0,38 eV). At 380 K a transition in the thermal variation of T 1 (linked to a weak crystallographic transition) is associated with the onset of nearly isotropic diffusion of the fluorine ions.
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