Superionic–protonic behavior of a new mixed sodium dihydrogen phosphate–arsenate at room temperature

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...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2011-04, Vol.406 (8), p.1546-1549
Main Authors: Jarraya, Khaled, Ennaceur, Nasreddine, El Marssi, Mimoun, Mhiri, Tahar
Format: Article
Language:English
Subjects:
Ambient superprotonic conduction
Condensed matter
Condensed matter: structure, mechanical and thermal properties
Conduction heating
Conductivity
Diffusion in solids
Exact sciences and technology
Hopping (conductivity)
KDP family
Phase transformations
Physics
Self-diffusion and ionic conduction in nonmetals
Sodium
Transport properties
Transport properties of condensed matter (nonelectronic)
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Summary: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.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2011.01.066