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The nuclear resonance of Al 27  in natural and synthetic spinel single-crystals was examined. In natural spinel the Al-ions predominantly occupy octahedrally coordinated sites with non-cubic point symmetry in the anion packing. The quadrupole splitting was measured and the maximum gradient of the electric field in the crystal at the position of the Al-nucleus was determined. In heated natural and synthetic spinel crystals the frequency bands of the satellites are so broadened, that the quadrupole splitting can only be recognised by the displacement of the central lines.

zeitschrift für kristallographie

Die elektrische Quadrupolaufspaltung von Al 27  in Spinell MgAl 2 O 4  und Korund Al 2 O 3: I. Paramagnetische Kernresonanz von Al 27  und Kationenverteilung in Spinell