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- W2565853816 abstract "Singly ionized oxygen vacancies are produced in $mathrm{LiAl}{mathrm{O}}_{2}$ crystals by direct displacement events during a neutron irradiation. These vacancies, with one trapped electron, are referred to as ${mathrm{V}}_{mathrm{O}}^{+}$ centers. They are identified and characterized using electron paramagnetic resonance (EPR) and optical absorption. The EPR spectrum from the ${mathrm{V}}_{mathrm{O}}^{+}$ centers is best monitored near 100 K with low microwave power. When the magnetic field is along the [001] direction, this spectrum has a $g$ value of 2.0030 and well-resolved hyperfine interactions of 310 and 240 MHz with the two $^{27}mathrm{Al}$ nuclei that are adjacent to the oxygen vacancy. A second EPR spectrum, also showing hyperfine interactions with two $^{27}mathrm{Al}$ nuclei, is attributed to a metastable state of the ${mathrm{V}}_{mathrm{O}}^{+}$ center. An optical absorption band peaking near 238 nm is assigned to ${mathrm{V}}_{mathrm{O}}^{+}$ centers. Bleaching light from a Hg lamp converts a portion of the ${mathrm{V}}_{mathrm{O}}^{+}$ centers to ${mathrm{V}}_{mathrm{O}}^{0}$ centers (these latter centers are oxygen vacancies with two trapped electrons). The ${mathrm{V}}_{mathrm{O}}^{0}$ centers have an absorption band peaking near 272 nm, a photoluminescence band peaking near 416 nm, and a photoluminescence excitation band peaking near 277 nm. Besides the oxygen-vacancy EPR spectra, a holelike spectrum with a resolved, but smaller, hyperfine interaction with one $^{27}mathrm{Al}$ nucleus is present in $mathrm{LiAl}{mathrm{O}}_{2}$ after the neutron irradiation. This spectrum is tentatively assigned to doubly ionized aluminum vacancies." @default.
- W2565853816 created "2017-01-06" @default.
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- W2565853816 date "2015-10-14" @default.
- W2565853816 modified "2023-10-15" @default.
- W2565853816 title "Oxygen vacancies in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>LiAl</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>crystals" @default.
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- W2565853816 doi "https://doi.org/10.1103/physrevb.92.144108" @default.
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