ISSN:
1862-0760
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The superionic conductivity and dielectric response of heavily doped fluorite-structured Ba1−xRxF2+x (R=La, Pr, Nd, Gd, Tb, Y, Sc; x=0.005–0.45) crystals are reported. The highest ionic conductivity is found for R=Sc and x=0.1. Upon ScF3 doping, small Sc3+ ions rearrange their surroundings, create excessive fluoride interstitial ions and bring about a high ionic conductivity. For each dopant, the concentration dependence of the ionic conductivity is non-linear. A monotonous concentration dependence of the ionic conductivity is found only for La3+ doping. Upon doping with Nd3+, Gd3+, Tb3+, Y3+ and Sc3+ ions, a conductivity maximum is observed at x=0.1–0.2. Upon Pr3+ doping, this maximum is split. The influence of defect clustering on the concentration dependence of the conductivity is discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02374152
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