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The band gap energy of BexMgyZn1−x−yO is estimated by modifying simplified coherent potential approximation. It is found that the model can give a good description for the band gap energy. The deviation between the results in this work and the experimental values is due to the phase separation and clusters. It is also found that the band gap energy of BexMgyZn1−x−yO is enlarged as the Mg content or...
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