Paramagnetic defects in BaTiO3 and their role in light-induced charge transport ? Optical studies
| Autor: | H. Kröse, O. F. Schirmer, P. Jacobs, E. Possenriede |
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| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
genetic structures Physics and Astronomy (miscellaneous) Chemistry General Engineering Charge (physics) General Chemistry Acceptor Molecular physics law.invention Paramagnetism Wavelength Nuclear magnetic resonance law Ionization General Materials Science sense organs Electron paramagnetic resonance Inorganic compound Single crystal |
| Zdroj: | Applied Physics A Solids and Surfaces. 55:73-81 |
| ISSN: | 1432-0630 0721-7250 |
| DOI: | 10.1007/bf00324605 |
| Popis: | On the basis of a previous identification of paramagnetic defects in nominally undoped as grown BaTiO3 single crystals, we have investigated the changes of the concentrations of these centers and their optical absorptions under illumination with light of varying wavelengths. The most pronounced charge transfers occur by hole ionization of Fe4+ and — to a lesser extent — of Cr5+ and Cr4+. At low temperatures the created holes are trapped in the form of O−-ions next to Al3+ or unknown acceptor defects. Corresponding Fe4+ and O− absorptions have been identified. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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