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- W1996630054 abstract "The reorientational properties of Ca${mathrm{F}}_{2}$ doped with the rare earths (RE) cerium, praesodymium, samarium, europium, and terbium were studied using the technique of ionic thermocurrents (ITC). The reorientational energies of the RE-${mathrm{F}}^{ensuremath{-}}$-interstitial complex formed were found to increase with increasing ionic radius of the impurity rare-earth ion, increasing more rapidly for the larger ions. All energies were much less than the free ${mathrm{F}}^{ensuremath{-}}$-interstitial activation energy. The preexponential factors were larger than the normal vibrational frequencies in the Ca${mathrm{F}}_{2}$ lattice and perhaps reflect the tight-binding nature of the complex. A natural Brazilian fluoride sample known to contain aluminum fit nicely with the other data. Oscillator strengths for the $4fensuremath{rightarrow}5d$ optical transition for the RE ion in tetragonal symmetry in the Ca${mathrm{F}}_{2}$ lattice were determined for Ce, Pr, and Tb using ITC and optical-absorption data. ITC runs on Sr${mathrm{F}}_{2}$: Eu were also made. The peak structure observed was more complicated. Three peaks were separated and their activation energies and frequency factors determined." @default.
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- W1996630054 date "1972-12-15" @default.
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- W1996630054 title "Ionic-Thermocurrent Study of Rare-Earth-Doped Ca<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><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>and Sr<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><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></…" @default.
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- W1996630054 doi "https://doi.org/10.1103/physrevb.6.4867" @default.
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