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- W1994714030 abstract "The effect of the ionic radius of trivalent impurities on the reorientation parameters of tetragonal charge-compensation centers in Ca${mathrm{F}}_{2}$ is studied. As it has been found in an earlier paper that electrical dipole-dipole interaction between the centers significantly modifies the reorientation behavior of dipoles, we have included this perturbation in our analysis of the results of the ionic-thermocurrents experiments. From the results we conclude that in $mathrm{Ca}{mathrm{F}}_{2}:{R}^{3+}$ there is an appreciable tendency of the impurities to coagulate to clusters; in contrast to results given in the literature the characteristic relaxation time ${ensuremath{tau}}_{0}$ associated with the jumping dipoles does not depend on the size of the trivalent impurity. The activation energy ${E}_{0}$ however increases with increasing ${R}^{3+}$ radius and the trend found for tetragonal centers in Ca${mathrm{F}}_{2}$ is the same as for Sr${mathrm{F}}_{2}$ observed by van Weperen and den Hartog. It is suggested that the variations are due to changes in the screening of the effective positive charge of the trivalent impurity." @default.
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- W1994714030 date "1979-04-15" @default.
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- W1994714030 title "Dipole reorientation of tetragonal charge-compensation centers in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Ca</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:mo>:</mml:mo><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></mml:math>" @default.
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- W1994714030 doi "https://doi.org/10.1103/physrevb.19.4162" @default.
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