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It is shown that good agreement with measured linewidths can be obtained if in the usual asymptotic spin-diffusion assumption for the spin autocorrelation function 〈Siα(τ)Siα(0)〉avατ-d(x)/2, d(x) is taken to be independent of x above the percolation concentration. Experimental results in the system KNixMg1-xF3 are also presented. These data exhibit striking differences with the behavior of isostructural KMnxMg1-xF3 whose origin is discussed."},{"label":"DOI","value":"10.1103/PhysRevB.32.7143"},{"label":"Volume","value":"32"},{"label":"Issue","value":"11"},{"label":"Publication Date","value":"D:00 M:12 Y:1985"},{"label":"Publication Information","value":"Copyright 1985 American Physical Society. 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