Abstract
The elaborate mixed material of the formula NaH 2(PO 4) 0.48(AsO 4) 0.52·H 2O denoted by NDAP belongs to a group of compounds having properties that are intermediate between those of a normal salt and an acid, and undergoes a transition from a paraelectric to a superprotonic phase transition at room temperature. The temperature phase transition (296 K) leading to a superionic–protonic phase characterized by an unusual high conductivity at room temperature was found. The conductivity relaxation parameters associated with the high-disorder protonic conduction have been determined from the analysis of the M″/ M″ max spectrum and measured in a wide temperature range. Transport properties in this material appear to be due to proton hopping mechanism.
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