Abstract
The spin-lattice relaxation time of 27Al nuclei residing in the octahedral and tetrahedral oxygen environment in Y3 −x LuxAl5O12 mixed aluminum-yttrium garnets was measured by the NMR method for 0≤x≤3. A maximum in the concentration dependence of the relaxation time was observed for both crystallographic positions at x=0.75; this maximum correlates with the minimum in the NMR linewidth, indicating the ordering obtained as the yttrium and lutetium ions occupy the dodecahedral positions in the garnet lattice.
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