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Using ab initio calculations on 108 atoms pure- and Ge-doped (2.8mol%) silica-based supercells, we performed a statistical study on the electronic structure and energetic contribution of neutral oxygen vacancies, also named Oxygen Deficient Centers (ODCs). All the 72 oxygen sites in the amorphous silica (a-SiO 2 ) cell were considered as possible candidates for the formation of the vacancies...
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