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| Home > Publications database > Superprotonic conductivity of (NH$_{4}$)$_{3}$H(SO$_{4}$)$_{2}$ in the high-temperature phase |
| Home > Publications database > Superprotonic conductivity of (NH$_{4}$)$_{3}$H(SO$_{4}$)$_{2}$ in the high-temperature phase |
| Journal Article | FZJ-2015-03003 |
; ; ; ;
2013
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.ssi.2013.06.011
Abstract: Impedance measurements were performed on single crystals of (NH4)3H(SO4)2 in the temperature range of 295–441 K. Anisotropy of protonic conductivity was found in the monoclinic room-temperature phase (space group C2/c) as well as in the rhombohedral high-temperature phase (space group R 3 ¯ m ). Above the high-temperature phase transition at 413 K, conductivity in the hexagonal (001) plane yields a value of ~ 10− 2 S cm− 1, which is typical for superionic conductors. A verification of a sample quality after the impedance measurements, using X-ray powder diffraction, showed minor additional peaks of (NH4)2(SO4). This suggests a beginning of thermal decomposition at high temperature. The possible pathways of proton conduction were discussed according to crystal structure analyses by single-crystal neutron diffraction method.
Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Key Technologies (1st) ; Information Technology and Functional Materials (1st) ; Crystallography (2nd) ; Condensed Matter Physics (2nd)
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