Nuclear Magnetic Resonance Study of Anion and Cation Dynamics in CsSiH3
Journal Article
·
· Journal of Alloys and Compounds
In order to study the dynamical properties of cesium silanide CsSiH3, we have measured the 1H and 133Cs nuclear magnetic resonance (NMR) spectra and spin-lattice relaxation rates in this compound over the temperature range of 5-354 K. The results of the 1H NMR measurements indicate that [SiH3]- anions in CsSiH3 retain unusually high reorientational mobility down to low temperatures. In particular, a significant narrowing of the proton NMR spectrum due to [SiH3]- reorientations is observed in the range ~10-14 K. The order-disorder (β→α) phase transition accompanied by the strong acceleration of [SiH3]- reorientations and by the change in the reorientational mechanism is observed above 200 K; according to the 1H spin-lattice relaxation data, this transition appears to be gradual. For the high-temperature disordered a-phase, the activation energy for [SiH3]- reorientations is found to be 41(4) meV. The 133Cs NMR results are consistent with the onset of diffusive motion of Cs+ cations at the frequency scale of ~104 s-1 above 300 K.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Program (EE-3F)
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1491139
- Report Number(s):
- NREL/JA-5900-73081
- Journal Information:
- Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 781; ISSN 0925-8388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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