Hampson Matthew R, Evans John S O, Hodgkinson Paul
Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
J Am Chem Soc. 2005 Nov 2;127(43):15175-81. doi: 10.1021/ja054063z.
The dynamics of oxygen motion in ZrW(2)O(8) have been characterized using (17)O solid-state NMR. Rates of dynamic exchange have been extracted from magnetization transfer experiments over a temperature range of 40 to 226 degrees C, and distinct values for the associated activation barrier have been observed on either side of the order/disorder phase transition at approximately 175 degrees C. A detailed model for the dynamical process is proposed, which reconciles the observation of continuing oxygen dynamics in the low-temperature phase with the static order implied by earlier X-ray diffraction studies.
利用¹⁷O固态核磁共振对ZrW₂O₈中氧的运动动力学进行了表征。通过在40至226摄氏度温度范围内的磁化转移实验提取了动态交换速率，并且在约175摄氏度的有序/无序相变两侧观察到了相关活化能垒的不同值。提出了一个详细的动力学过程模型，该模型将低温相中持续的氧动力学观测结果与早期X射线衍射研究所暗示的静态有序相协调起来。
