NMR studies of local motions in fast protonic conductors

There are a number of review articles summarizing and critically examining the NMR studies of FlCs, and many of them contain some discussion of fast protonic conductors. Many features of the NMR studies are similar for protonic and other fast ionic conductors. However, there are also aspects peculiar to FPCs, an important one being the influence of local dynamics. In this article, we shall be specifically concerned with NMR studies of local motions in FPCs in contrast to the long range diffusion which is being discussed elsewhere in this book (see p. 412). 

In general, an NMR spectrum is determined by some or all of the terms of the following Hamiltonian  

If there is motion (either local or long range), depending upon the relative magnitudes of the time scale of the motion and the inverse of the strength of the particular interaction the NMR spectrum will be profoundly influenced. An important consequence is that there will be 

In the following, we shall illustrate the application of various NMR techniques to understand the different aspects of local dynamics in FPCs. Where relevant, we shall also touch upon the long range motion briefly. We shall try to point out at appropriate places the problems associated with the interpretation of NMR results and attempts to resolve the problems. In Table 22.1, the information obtained on protonic conductors using various NMR techniques is presented. 

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NMR studies of local motions in fast protonic conductors... 

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