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STRUCTURAL FEATURES OF FLUORIDE-ION TRANSPORT IN Pb0.67Cd0.33F2 SINGLE CRYSTALS

V. Trnovcová1,2,* , P. P. Fedorov3, M. Ožvoldová1, I. I. Buchinskaya3, E. A. Zhurova3

Affiliation

  1. Faculty of Materials Science and Technology, Slovak University of Technology, SK- 91724 Trnava, Slovakia
  2. Institute of Physics, Slovak Academy of Sciences, SK-84228 Bratislava, Slovakia
  3. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow 117333, Russia

Abstract

Using the X-ray single crystal diffraction technique, the crystal structure of the Pb0.67Cd0.33F2 single crystal was studied. This fluorite-structured crystal (space group Fm3m, a = 0.57575(4) nm) has the highest ionic conductivity of the Pb1-xCdxF2 solid solutions. The statistical displacement of cations achieves 0.05 nm, and the deficiency of fluoride ions in lattice positions is equal to 25–2 %. From the measured temperature dependence of the ionic conductivity, sT = (1.2–0.3) × 107 exp(-0.359–0.007/kT), we have calculated the temperature dependence of the hopping frequency of fluoride ions. Upon doping with 1m/o LiF and with 1 or 3 m/o NaF, the ionic conductivity decreases. For doped crystals, the equation sT = (1.4–0.2)107 exp(-0.389–0.005/kT) is valid..

Keywords

Fast ionic conductivity, Fluoride ion hopping frequency, Phase diagram, Defect concentration, Single crystal, Lead fluoride, Cadmium fluoride.

Submitted at: July 15, 2003
Accepted at: July 31, 2003

Citation

V. Trnovcová, P. P. Fedorov, M. Ožvoldová, I. I. Buchinskaya, E. A. Zhurova, STRUCTURAL FEATURES OF FLUORIDE-ION TRANSPORT IN Pb0.67Cd0.33F2 SINGLE CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 3, pp. 627-634 (2003)