Electrical Properties of Heavily Doped Fluorite-Structured BaF2:RF3 (R = La, Pr, Nd, Gd, Tb, Y, Sc) Single Crystals

被引:10
作者
Trnovcova, V. [1 ,2 ]
Sorokin, N. I. [3 ]
Fedorov, P. P. [3 ]
Krivandina, E. A. [3 ]
Sramkova, T. [2 ]
Sobolev, B. P. [3 ]
机构
[1] Slovak Univ Technol, Fac Mat Sci & Technol, SK-91724 Trnava, Slovakia
[2] Slovak Acad Sci, Inst Phys, SK-84228 Bratislava, Slovakia
[3] Russian Acad Sci, Shubnikovs Inst Crystallog, Moscow 117333, Russia
关键词
D O I
10.1007/BF02374152
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:351 / 358
页数:8
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