Abstract
The current research aims at manipulation of physical properties of spinel MgAl2O4 by substitution of Sr2+ cations at tetrahedral and Cr3+ at orthogonal-sites. Synthesized materials were studied by XRD, TGA, SEM, EDX and UV–visible, diffuse reflectance and photoluminescence spectroscopy. A series of Sr2+ and Cr3+ doped derivatives with the general formula Mg1-xSrxAl2-yCryO4 (where x, y = 0.2, 0.4, 0.6, 0.8 and 1.0) have been produced and investigated using the co precipitation technique. Although strain in the cubic crystal structure of magnesium aluminate spinel was seen upon doping due to Sr2+'s higher cationic radius, the structure remained reserved (spinel) for low dopant concentration (x, y = 0.2, 0.4, 0.6). The behavior of activator ions Cr3+ in these derivatives is supposed to be altered due to change in site occupancy. Due to presence of antisites defects activator ions; structural, optical, thermal, electrical properties of MgAl2O4 material were modified.
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