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• W2068032927 startingPage "9299" @default.
• W2068032927 abstract "An MgO crystal was thermochemically reduced (TCR) under extreme reducing conditions such that the concentration of anion vacancies $(F$ centers) was exceptionally large, $6ifmmodetimeselsetexttimesfi{}{10}^{18}{mathrm{cm}}^{ensuremath{-}3}.$ Optical absorption measurements demonstrate that in addition to F centers absorbing at $250mathrm{nm},$ anion-vacancy clusters absorbing at $355,$ $406,$ $440,$ $480,$ and $975$ nm were observed. Upon thermal annealing in a reducing atmosphere, a broad extinction band at 345 nm with a full width at half maximum (FWHM) of 1.25 eV emerged. With further heat treatment the peak wavelength shifted toward 370 nm and the FWHM varied between $1.25$ and 2.25 eV. Transmission electron microscopy (TEM) showed that concomitantly there exist rectangular defects with typical dimensions of $3mathrm{nm}.$ Microdiffraction, x-ray microanalysis, and high-resolution electron microscopy, in conjunction with Mie theory, indicate that these rectangular defects are nanocavities with their walls plated with magnesium. Therefore, both oxygen vacancies and magnesium-rich regions have been observed in a thermochemically reduced MgO crystal." @default.
• W2068032927 created "2016-06-24" @default.
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• W2068032927 date "2000-10-01" @default.
• W2068032927 modified "2023-10-16" @default.
• W2068032927 title "Formation of anion-vacancy clusters and nanocavities in thermochemically reduced MgO single crystals" @default.
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• W2068032927 doi "https://doi.org/10.1103/physrevb.62.9299" @default.
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