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Title: Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals

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}

Authors:
; ; ;  [1];  [2];  [3];  [3];  [3]
  1. Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid (Spain)
  2. Division of Materials Science, Department of Energy, Germantown, Maryland 20874-1290 (United States)
  3. Institute for Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga (Latvia)
Publication Date:
OSTI Identifier:
306262
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 59; Journal Issue: 7; Other Information: PBD: Feb 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNESIUM COMPOUNDS; MAGNESIUM OXIDES; VACANCIES; THERMOCHEMICAL PROCESSES; TRAPS; PHOTOLUMINESCENCE; F CENTERS; HYDRIDES; IONS; ABSORPTION SPECTRA; CRYSTAL DEFECTS; TRAPPING; HOLES; REDUCTION

Citation Formats

Gonzalez, R, Monge, M A, Santiuste, J E, Pareja, R, Chen, Y, Kotomin, E, Kukla, M M, Department of Electrical Engineering, Michigan Technological University, Hougton, Michigan 49931, Popov, A I, and Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid. Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.59.4786.
Gonzalez, R, Monge, M A, Santiuste, J E, Pareja, R, Chen, Y, Kotomin, E, Kukla, M M, Department of Electrical Engineering, Michigan Technological University, Hougton, Michigan 49931, Popov, A I, & Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid. Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals. United States. doi:10.1103/PhysRevB.59.4786.
Gonzalez, R, Monge, M A, Santiuste, J E, Pareja, R, Chen, Y, Kotomin, E, Kukla, M M, Department of Electrical Engineering, Michigan Technological University, Hougton, Michigan 49931, Popov, A I, and Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid. Mon . "Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals". United States. doi:10.1103/PhysRevB.59.4786.
@article{osti_306262,
title = {Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals},
author = {Gonzalez, R and Monge, M A and Santiuste, J E and Pareja, R and Chen, Y and Kotomin, E and Kukla, M M and Department of Electrical Engineering, Michigan Technological University, Hougton, Michigan 49931 and Popov, A I and Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid},
abstractNote = {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}},
doi = {10.1103/PhysRevB.59.4786},
journal = {Physical Review, B: Condensed Matter},
number = 7,
volume = 59,
place = {United States},
year = {1999},
month = {2}
}