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Author Gonzalez, R. ♦ Monge, M. A. ♦ Santiuste, J. E. ♦ Pareja, R. ♦ Chen, Y. ♦ Kotomin, E. ♦ Kukla, M. M. ♦ Popov, A. I.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MAGNESIUM COMPOUNDS ♦ MAGNESIUM OXIDES ♦ VACANCIES ♦ THERMOCHEMICAL PROCESSES ♦ TRAPS ♦ PHOTOLUMINESCENCE ♦ F CENTERS ♦ HYDRIDES ♦ IONS ♦ ABSORPTION SPECTRA ♦ CRYSTAL DEFECTS ♦ TRAPPING ♦ HOLES ♦ REDUCTION
Abstract Optical absorption and luminescence experiments were used to study the photoconversion of neutral oxygen vacancies ({ital F} centers) in MgO single crystals thermochemically reduced at elevated temperatures. In crystals with an undetectable concentration of hydride ions and a moderate concentration of {ital F} centers ({approx}10{sup 17} cm{sup {minus}3}), excitation with UV-light produces positively charged anion vacancies (F{sup +} centers) and electrons which are subsequently trapped at impurities. Under continuous excitation, the F{sup +} centers release holes which are trapped at cation vacancies charge compensated by impurities. In crystals with high concentrations of both hydride ions and {ital F} centers ({approx}10{sup 18} cm{sup {minus}3}), the electrons from the {ital F} to F{sup +} photoconversion are trapped mainly at the hydride ions to form H{sup 2{minus}} ions, which are metastable at room temperature. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-02-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 59
Issue Number 7


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