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The full potential linear muffin-tin orbital (FP-LMTO) method was applied to study the structural and electronic properties of the compounds MgO, ZnO and their alloy MgxZn1–xO in the zincblende and NaCl structures. Results are obtained using the local density approximation (LDA), the ground-state properties like lattice constant and bulk modulus obtained agree very well with experimental and other theoretical calculations. The effect of composition on lattice constant from Vegard’s law and the bulk modulus was investigated. The microscopic origins of the gap bowing were explained by using the approach of Zunger and co-workers. It is concluded that the energy band gap bowing is primarily due to chemical charge-transfer effect. Contribution of volume deformation and structural relaxation to the gap bowing parameter is found to be very small.

Theoretical Study on the Origins of the Gap Bowing in Mg&lt;sub&gt;x&lt;/sub&gt;Zn&lt;sub&gt;1–x&lt;/sub&gt;O Alloys

Theoretical Study on the Origins of the Gap Bowing in Mg<sub>x</sub>Zn<sub>1–x</sub>O Alloys