Issue 45, 2013

1H-NMR measurements of proton mobility in nano-crystalline YSZ

Abstract

We report nuclear magnetic resonance (NMR) results on water saturated, dense, nano-crystalline YSZ samples (9.5 mol% yttria doped zirconia) which exhibit proton conductivity at temperatures as low as room temperature. 1H-NMR spectra recorded under static and magic angle spinning conditions show two distinct signals. Their temperature-dependent behavior and their linewidths suggest that one can be attributed to (free) water adsorbed on the surface of the sample and the other one to mobile protons within the sample. This interpretation is supported by comparison with measurements on a single-crystalline sample. For the nano-crystalline samples motional narrowing is observed for the signal originating from protons in the sample interior. For these protons, the analysis of temperature and field dependent spin-lattice relaxation time T1 points towards diffusion in a confined two-dimensional geometry. We attribute this quasi two-dimensional motion to protons that are mobile along internal interfaces or nanopores of nano-crystalline YSZ.

Graphical abstract: 1H-NMR measurements of proton mobility in nano-crystalline YSZ

Additions and corrections

Article information

Article type
Paper
Submitted
30 Jul 2013
Accepted
04 Oct 2013
First published
09 Oct 2013

Phys. Chem. Chem. Phys., 2013,15, 19825-19830

1H-NMR measurements of proton mobility in nano-crystalline YSZ

J. Hinterberg, A. Adams, B. Blümich, P. Heitjans, S. Kim, Z. A. Munir and M. Martin, Phys. Chem. Chem. Phys., 2013, 15, 19825 DOI: 10.1039/C3CP53039F

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