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• W2019957291 abstract "NH4TaWO6, ND4TaWO6, and NH4NbWO6 have been studied by NMR at various frequencies and over a large range of temperatures. At low temperatures, ammonium ions exist as an entity tunnelling in the center of the cavities of the pyrochlore framework. From relaxation data an activation energy of this process of about 6.5 kJ/mol is obtained for all three materials. At temperatures above about 250 K translational motion narrows the spectra and produces relaxation. The experiments suggest a Grotthus type of proton transfer, where both local back - and forth-hopping (13–20 kJ/mol) and long range migration (31–39 kJ/mol) plays a role. At higher temperatures NH4+ and NH3 may diffuse as a whole. This is shown in particular for NH4NbWO6 which served as diaphragm in a water vapour electrolysis cell, and where ammonia becomes exchanged by water." @default.
• W2019957291 created "2016-06-24" @default.
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• W2019957291 date "1989-02-01" @default.
• W2019957291 modified "2023-09-25" @default.
• W2019957291 title "NMR studies of molecular motion in various defect pyrochlores containing ammonium" @default.
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• W2019957291 doi "https://doi.org/10.1002/bbpc.19890930208" @default.
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