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Grazing X-ray diffraction was used to study in details the behaviour of two spinels, ZnAl 2 O 4 and MgAl 2 O 4 irradiated by swift ions. Such an irradiation allows to have an important irradiated depth and then accurate diffraction diagrams. Rietveld refinement done on these diagrams clearly show an order-disorder transition due to a melting of cations under irradiation...