Abstract
19F wide-line N.M.R. experiments have been performed at 30 MHz over the temperature range 173–300 K, on three samples (x = 0.400 − 0.500 − 0.714) of the Bi 1−xPb xO 1.5−x solid solution. Comparison of the experimental and theoretical values of the second monent M 2, clearly indicates an ordered distribution of fluorine and oxygen atoms within the anionic subcell. The oxygen atoms are strictly located in the tetrahedral and octahedral holes of the “fluorite-like” layer of this A-La 2O 3 -related structure. Such an order, if preserved at high temperature, should play an important role in the conduction process.
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