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- W1970059637 abstract "N.m.r. measurements of spin–lattice relaxation time, T1, and spin–spin relaxation time, T2, give valuable information on diffusive motion in a wide variety of solids when self-diffusion provides the dominant relaxation mechanism. These measurements however have a limited useful range. As the mean time, τ, between jumps increases, the effects of paramagnetic impurities can dominate T1 and T2 reaches a constant rigid lattice value. These limitations can be overcome by measuring the spin–lattice relaxation time in the presence of an r.f.field, T1ρ, or the spin–lattice relaxation time in the dipolar field, T1D. Recent theoretical developments often allow τ to be evaluated with reasonable accuracy and if the jump distance is known then the self-diffusion coefficient, D, can be calculated. Paramagneticimpurity effects can also cause anomalous results in the solid in the fast diffusion range. The technique and its limitations will be illustrated by recent work on 19F– diffusion studies in fluorite lattices. Measurements of these relaxation times provide information at the microscopic level on the atomic motion and thus can indicate the dominant diffusion mechanism." @default.
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- W1970059637 date "1978-01-01" @default.
- W1970059637 modified "2023-09-26" @default.
- W1970059637 title "Self-diffusion studies in solids using nuclear magnetic resonance techniques" @default.
- W1970059637 doi "https://doi.org/10.1039/fs9781300153" @default.
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