Photoconversion and dynamic hole recycling process in anion vacancies in neutron-irradiated MgO crystals

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.3787· OSTI ID:357305

Monge, M A; Gonzalez, R; Munoz Santiuste, J E; Pareja, R ^[1]; Chen, Y ^[2]; Kotomin, E A ^[3]; Popov, A I ^[3]

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1. Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid (Spain)
2. Division of Materials Sciences, U. S. Department of Energy, Germantown, Maryland 20874-1290 (United States)
3. Institute for Solid State Physics, University of Latvia, 8 Kengaraga, LV-1064 Riga (Latvia)

Optical spectroscopy and theory demonstrate that photon excitation of the positively charged anion vacancies (F{sup +} centers) at 5.0 eV in neutron-irradiated MgO crystals releases holes that are subsequently trapped at {ital V}-type centers, which are cation vacancies charge compensated by impurities, such as Al{sup 3+}, F{sup {minus}}, and OH{sup {minus}} ions. The concentration of trapped-hole centers was found to exceed that of available anion vacancies. The disproportionately large amount of holes produced is attributed to a dynamic recycling process, by which the F{sup +} center serves to release a hole to the {ital V}-type centers and subsequently trap a hole from an Fe{sup 3+} ion. The net effect was the increase of {ital V}-type centers mostly at the expense of Fe{sup 3+} ions. It was also shown that concurrently there was a component which distributed holes directly from Fe{sup 3+} to the {ital V}-type centers. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 357305
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FLUORINE IONS
HOLES
HYDROXYL RADICALS
IMPURITIES
IRON IONS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
NEUTRON DIFFRACTION
PHYSICAL RADIATION EFFECTS
VACANCIES
VISIBLE SPECTRA