Effect of low dimensionality

Dimensionality of ionic transport lower than three can have drastic consequences for NMR spectra as shown by Richards . Recently, Bjorkstam et al. pointed out the importance of properly modelling the correlation functions in obtaining correct parameters from NMR data. Thus it becomes important to decide on the relative importance of the two effects. With this object in mind, compounds of the type HMfFOg.xf/jO (M = Nb, Ta) were prepared in both three dimensional (cubic pyrochlore) and two dimensional (layered) structures and were 

2- D system the motional narrowing occurs at a much lower temperature and is much sharper compared to that in the 3-D system. The and Ti, data give meaningful motional parameters only when fitted to a 2-D model. However, t oS orders of magnitude lower are observed even for the 

In this short review, we have tried to illustrate how various NMR 

for example, C. P. Slichter, Principles of Magnetic Resonance 2nd edition (Springer-Verlag, Berlin (1978)). 

Whittingham and B. G. Silbemagel in Solid Electrolytes, General Principles, Characterization, Materials and Applications, P. Hagenmuller and W. van Gool (eds) (Academic Press (1978)) 93-108. 

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