Abstract
A general theoretical treatment is developed for NMR spin-lattice (T1 and T1 rho ) and spin-spin (T2) times for relaxation due to modulation for dipolar interactions by diffusion of atoms on inequivalent lattice sites. This extends previous calculations of T2 to the other relaxation parameters and gives rate equations for a single nuclear species moving over several inequivalent lattice sites and interacting with other (static) nuclear species. The temperature dependences of the relaxation times are shown to have specified characteristics, such as minima in T2 and multiple minima in T1 rho . The formalism is then used to analyse data obtained for LaF3 to evaluate details of fluorine-ion motion. Its applicability is successfully demonstrated.
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