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- W1972947548 abstract "In this paper we present results of Raman scattering experiments on Ba${mathrm{F}}_{2}$ and Sr${mathrm{F}}_{2}$ single crystals, doped with trivalent La ions, in the temperature range 300-1400 K. The linewidth of the Raman peaks in heavily doped materials is partly due to time-dependent effects from hopping interstitial fluoride ions, which are present in large numbers because of the excess positive charge of the La ions. From a comparison of experiment with the results of a theoretical treatment we find that the hopping energy of interstitial fluoride ions in a Ba${mathrm{F}}_{2}$ crystal doped with 3.1 mol% La${mathrm{F}}_{3}$ is 0.60 eV, whereas the corresponding value for a crystal with 7.3 mol% La${mathrm{F}}_{3}$ is 0.35 eV. For crystals with higher La concentrations the activation energy is lower. This decrease can be explained in terms of defect-defect interactions." @default.
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- W1972947548 date "1982-06-01" @default.
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- W1972947548 title "Raman spectroscopy of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Ba</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi>R</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow…" @default.
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- W1972947548 doi "https://doi.org/10.1103/physrevb.25.6602" @default.
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