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- W2083183886 abstract "Audiofrequency complex impedance measurements have been performed on pure and alkali-metal-doped lead fluoride at zero pressure over the temperature range 5.5 to 380K and at pressures up to 0.25 GPa over the temperature range 260 to 333K. The dielectric spectra show distinct alkali-metal-associated relaxations in each case. The activation enthalpies for the principal relaxations in sodium-, potassium- and rubidium-doped PbF2 (0.221, 0.252 and 0.218 eV respectively) are close to that for the motion of free vacancies. Thus the peaks are attributable to the motion of bound fluorine vacancies around the substitutional impurity ions. The principal relaxation observed for the lithium-doped samples, lithium ions being the smallest of the alkali metals, has a higher activation energy (0.331 eV). This may be due to the reorientation of Li+-substitutional-Li+-interstitial pairs. The ionic conductivity at temperatures above those of the dielectric peaks is interpreted in terms of the thermal dissociation of the impurity-vacancy complexes. The activation energies and activation volumes were found to be very sensitive to ion size, both reaching a maximum for the potassium dopant. Finally, the ratio of activation volumes to activation energies was found to be the same for all dopants, in excellent agreement with theoretical predictions." @default.
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- W2083183886 date "1984-09-10" @default.
- W2083183886 modified "2023-10-10" @default.
- W2083183886 title "Dielectric relaxation, ionic conductivity and activation volumes in cubic lead fluoride doped with alkali-metal cations" @default.
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- W2083183886 doi "https://doi.org/10.1088/0022-3719/17/25/004" @default.
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