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Information × Registration Number 0200U004211, 0197U017344 , R & D reports Title Development of scientific basis for fabrication of highly effective photoconductors popup.stage_title Head Glynchuk Majya Davydivna, Registration Date 05-06-2000 Organization Frantzevich Insitute for Materials Science Problems of the Ukranian National Academy of Sciences popup.description2 Studies of photoinduced centers were carried out by ESR method in nominally pure crystals KTaOз. Three types of paramagnetic centers (two of them are related with oxygen vacancy Ta(4+) -Vо , Ta(4+) - v -Me(4+) and third one is Ta(4+) - OH(-)) were detected. It is clarified that Ta centers are shallow donors. For the temperatutes T>30 K the centers are transformrd into oxygen vacancy Vo or OH(-) respectively. Their energetic levels are situated at 26 meV and 8 meV below conduction band bottom. The symmetry of centers is inverse-broken by photoelectron localization near one of two equivalent Ta ions nearest to the Vo or OH(-). Product Description popup.authors popup.nrat_date 2020-04-03 Close