Abstract
NMR relaxation time measurements have been made at 20 MHz for proton in polycrystalline hydronium beta″ alumina. Motional narrowing occurs at T > 62;230 K( E a = 19 kJ mol −1) in the fully hydrated beta″ alumina and the relaxation behavior is compatible with fast proton transport. The protonic motion in the partially dehydrated beta″ alumina has a high activation energy as 24.5 kJ mol −1.
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