Nuclear Magnetic Resonance Study of Anion and Cation Dynamics in CsSiH3

Mirjana Dimitrievska, R. Skoryunov, O. Babanova, A. Soloninin, A. Skripov, J.-N. Chotard, R. Janot, W. Tang, T. Udovic

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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 (..beta.. --> ..alpha..) 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.
Original languageAmerican English
Pages (from-to)913-918
Number of pages6
JournalJournal of Alloys and Compounds
StatePublished - 2019

NREL Publication Number

  • NREL/JA-5900-73081


  • diffusion
  • energy storage materials
  • nuclear resonances


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