A room temperature Raman study has been performed on polycrystalline samples of HTaWO6·xH2O and HTaTeO6·xH2O, protonic conductors, and, for comparison, on their respective potassium precursors. The hydrated and dehydrated forms of all four compounds, as well as the deuterated Ta-W pyrochlore, have been investigated with reference to host structure vibrations, which fall mainly below 1000 cm-1, and to internal modes of H2O or D2O molecules. A comparative analysis of all these vibrations, in particular the OH stretching mode, indicates that a minimum interaction occurs between water and other species in HTaWO6·H2O. These spectroscopic findings would exclude a direct role of the water molecule in the proton diffusion mechanism, via the formation of H3O+ species

Cazzanelli, E., Mariotto, G., Catti, M., Mari, C. (1991). Raman spectroscopy of HTaMO6 •H2O (M = W and Te) pyrochlores and their precursors. SOLID STATE IONICS, 46(1-2), 135-140 [10.1016/0167-2738(91)90141-W].

Raman spectroscopy of HTaMO6 •H2O (M = W and Te) pyrochlores and their precursors

CATTI, MICHELE;MARI, CLAUDIO MARIA
1991

Abstract

A room temperature Raman study has been performed on polycrystalline samples of HTaWO6·xH2O and HTaTeO6·xH2O, protonic conductors, and, for comparison, on their respective potassium precursors. The hydrated and dehydrated forms of all four compounds, as well as the deuterated Ta-W pyrochlore, have been investigated with reference to host structure vibrations, which fall mainly below 1000 cm-1, and to internal modes of H2O or D2O molecules. A comparative analysis of all these vibrations, in particular the OH stretching mode, indicates that a minimum interaction occurs between water and other species in HTaWO6·H2O. These spectroscopic findings would exclude a direct role of the water molecule in the proton diffusion mechanism, via the formation of H3O+ species
Articolo in rivista - Articolo scientifico
Solid state protonic conductors, proton diffusion mechanism
English
1991
46
1-2
135
140
none
Cazzanelli, E., Mariotto, G., Catti, M., Mari, C. (1991). Raman spectroscopy of HTaMO6 •H2O (M = W and Te) pyrochlores and their precursors. SOLID STATE IONICS, 46(1-2), 135-140 [10.1016/0167-2738(91)90141-W].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/45359
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