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ThispaperpresentsastudyonelectronicstructuresofdefectsassociatedwithoxygenvacancyVOandleadvacancyVPbinleadtungstatecrystals (PbWO4) ,bytherelativisticself consistentdiscretevariationalembeddedclustermethod .Furthermore,theexcitationenergyisalsocalculated.WefoundthatWO3 +VOcouldbetheabsorptioncenterat3 50nmand 42 0nm ,andtheexistenceofVPbcandiminishthebandgapofWO42 -.
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