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- W2000481807 abstract "The diffusion of ${mathrm{F}}^{ensuremath{-}}$ ions in yttrium iron garnet has been induced for the first time and investigated by magneto-optical techniques. Crystals of composition ${mathrm{Y}}_{3ensuremath{-}x}{mathrm{Ca}}_{x}{mathrm{Fe}}_{5}{mathrm{O}}_{12ensuremath{-}x}{mathrm{F}}_{x}$ (with $xensuremath{approx}0.3$) were grown, and diffusion of ${mathrm{F}}^{ensuremath{-}}$ ions out of the sample was induced by high-temperature annealing in oxygen. The replacement of ${mathrm{F}}^{ensuremath{-}}$ with ${mathrm{O}}^{2ensuremath{-}}$ ions induces ${mathrm{Fe}}^{4+}$ ions, whose magnetic circular dichroism in the near-infrared is used as a sensitive monitor of the diffusion process. This phenomenon can be well described in terms of the classical diffusion equation, with a diffusion coefficient $D$ uniform and constant, temperature activated according to the law $D={D}_{0}mathrm{exp}(ensuremath{-}frac{E}{mathrm{kT}})$, with ${D}_{0}=6.5ifmmodepmelsetextpmfi{}1.0$ ${mathrm{cm}}^{2}$ ${mathrm{s}}^{ensuremath{-}1}$ and $E=3.42ifmmodepmelsetextpmfi{}0.15$ eV. These values might indicate that microscopically the ${mathrm{F}}^{ensuremath{-}}$, ${mathrm{O}}^{2ensuremath{-}}$ ion exchange occurs with the intervention of an anion vacancy." @default.
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- W2000481807 date "1983-09-15" @default.
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- W2000481807 title "Diffusion of fluorine ions in yttrium iron garnet" @default.
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- W2000481807 doi "https://doi.org/10.1103/physrevb.28.3422" @default.
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