LOW TEMPERATURE SYNTHESIS AND OPTICAL PROPERTIES OF (Cu, Cr, Fe) Al2O4 NANOCRYSTALLINE SPINEL MATERIALS

In the present investigation, (Cu, Cr, Fe) Al2O4 spinel was synthesized from decagonal quasicrystalline precursor using mechanical milling followed by air annealing. The optimum annealing temperature and time were found to be 600 degrees C and 60 h respectively. The evolution of the spinel structure started upon air annealing at 600 degrees C from the B2 phase formed due to milling of quasicrystalline phase for 40 h. The relevant optical property of mechanically milled and air annealed samples prepared at di r erent temperatures (400 degrees C, 500 degrees C and 600 degrees C) were evaluated by photoluminescence technique. These studies suggested the presence of emission characteristics in blue region i. e. at 430 nm.