Abstract
The nine parameter rigid-ion model has been used to calculate the vibrational, elastic and thermodynamic properties of Co3O4, Co2AlO4 and CoAl2O4. The effect of copper ion on the examined properties of the studied compounds has been examined. The main outcome of the present study is that the bond stretching and bond bending interatomic interactions up to third nearest neighbour decreases in the following sequence: Co3O4→Co2AlO4→CoAl2O4 and the first neighbour interatomic interactions are stronger than the other interatomic interactions. The calculated elastic constants show that the examined compounds are mechanically stable with a noticeable elastic anisotropy. The bulk, shear and Young’s moduli decrease in the following sequence: Co3O4→Co2AlO4→CoAl2O4. All studied materials are ductile in nature.
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