MOLECULAR-DYNAMICS AND THE PHASE-TRANSITION IN SOLID C60
MOLECULAR-DYNAMICS AND THE PHASE-TRANSITION IN SOLID C60
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DOI：
10.1103/physrevlett.67.1886
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发表时间：
1991-09-30
影响因子：
8.6
通讯作者：
ZAHURAK, SM
中科院分区：
文献类型：
--
作者：
TYCKO, R;DABBAGH, G;ZAHURAK, SM
本文用~（13）C NMR方法研究了固体C_（60）两相的分子取向动力学。 从自旋-晶格弛豫数据中提取的动力学参数的变化表明，动力学性质的变化发生在260 K的相变处。 在过渡区之上，分子似乎在执行连续的旋转扩散;在过渡区之下，它们似乎在两个等效取向之间跳跃。 这一解释与Heiney等人的X射线衍射结果以及我们的NMR弛豫和光谱数据一致。
We characterize the molecular reorientational dynamics in two phases of solid C60 with C-13 NMR measurements. A change in the nature of the dynamics, indicated by a change in kinetic parameters extracted from spin-lattice relaxation data, occurs at the phase transition at 260 K. Above the transition, the molecules appear to execute continuous rotational diffusion; below the transition, they appear to jump between symmetry-equivalent orientations. This interpretation is consistent with the x-ray-diffraction results of Heiney et al. as well as our NMR relaxation and spectral data.