Abstract
Nuclear magnetic resonance (NMR) experiments recording the recovery of the magnetization of the nuclei in one phase, following the excitation of the nuclei in the other phase, is a classical way of studying blends inhomogeneous at the nanometer scale. Interpretation of the time recovery in terms of the spatial dimension requires knowledge of the two-phase spin diffusion coefficientsD 0. A new method of measurement ofD 0 is proposed on the basis of variable angle-tilted rotatory frame relaxation in homogeneous samples doped with paramagnetic centers. The choice of the tilt angle allows one to finely balance the direct relaxation by the paramagnetic center and the spin diffusion. The shape of the relaxation is analyzed with the solution for the diffusion-limited regimeM(t)/M(0)=exp[−(r 2 t)1/2−r 1 t] andD 0 then calculated fromr 1,r 2 and the concentration of paramagnetic centers. Conditions where reliable results can be obtained both theoretically and numerically are explored. The method has been implemented and applied to polycrystalline Mn-doped CaF2 leading toD 0=540±60 nm2/s, in agreement with existing values on this model compound.
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Meurer, B., Weill, G. A tilted rotatory frame method for the measurement of nuclear spin diffusion coefficients in solids doped with paramagnetic centers: Mn-Doped CaF2 . Appl. Magn. Reson. 23, 133–147 (2002). https://doi.org/10.1007/BF03166191
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DOI: https://doi.org/10.1007/BF03166191