TY  - JOUR
AU  - Sohn, Y. J.
AU  - Sparta, K. M.
AU  - Meven, M.
AU  - Roth, G.
AU  - Heger, G.
TI  - Superprotonic conductivity of (NH$_{4}$)$_{3}$H(SO$_{4}$)$_{2}$ in the high-temperature phase
JO  - Solid state ionics
VL  - 252
SN  - 0167-2738
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2015-03003
SP  - 116 - 120
PY  - 2013
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000328239600018
DO  - DOI:10.1016/j.ssi.2013.06.011
UR  - https://juser.fz-juelich.de/record/190044
ER  -