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- W2051818189 abstract "The local static and dynamic properties of the mixed crystals Na(CN)xCl1-x are studied by 23Na NMR over a wide concentration range. Special emphasis is laid upon systems which transform into a low-temperature glass state (x<or approximately=0.7). The strong anisotropy of the lineshapes could be accounted for by assuming that the principal axes of the electric field gradient tensors are oriented parallel to the axes of the average cubic structure with the principal components distributed according to a gaussian law. Between 200 and 100K, the width of this distribution increases by one order of magnitude indicating considerable local changes, which are attributed to a transition into an orientational glass state. From the temperature dependence of the 23Na spin-lattice relaxation time, the temperature dependence of the correlation times describing the motions of the CN ions in their local potentials are deduced for various concentrations x. In the temperature region where the transition to the glass state takes place the motions remain fast compared with the timescale of the NMR experiment (reciprocal Larmor frequency) but the type of motions changes gradually. A qualitative model is developed which basically assumes that decreasing temperature deviations from the cubic symmetry of the local potentials occur progressively as a consequence of cooperative phenomena. Measurements of the 23Na satellite T1 exclude slow fluctuations in kHz regime." @default.
- W2051818189 created "2016-06-24" @default.
- W2051818189 creator A5059675484 @default.
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- W2051818189 date "1986-06-30" @default.
- W2051818189 modified "2023-10-14" @default.
- W2051818189 title "23Na NMR study of the local static and dynamic properties of the orientational glass Na(CN)xCl1-x" @default.
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- W2051818189 doi "https://doi.org/10.1088/0022-3719/19/18/011" @default.
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