Fast ionic conductivity of PbF2:MF2 (M = Mg, Ba, Cd) and PbF2:ScF3 single crystals and composites

被引：45

作者：

Trnovcová, V

Fedorov, PP

Buchinskaya, II

Smatko, V

Hanic, F

机构：

[1] Slovak Univ Technol Bratislava, Fac Mat Sci & Technol, SK-91724 Trnava, Slovakia

[2] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 117333, Russia

[3] Slovak Acad Sci, Inst Elect Engn, SK-84226 Bratislava, Slovakia

[4] Slovak Acad Sci, Inst Inorgan Chem, SK-84236 Bratislava, Slovakia

来源：

SOLID STATE IONICS | 1999年 / 119卷 / 1-4期

关键词：

solid electrolytes; fast fluoride-ion conductivity; lead fluoride-based superionics; concentrated solid solutions; isovalent doping; heterovalent doping; composites prepared from the melt; eutectic composites; near-eutectic composites; static permittivity; microstructure;

D O I：

10.1016/S0167-2738(98)00501-3

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 fluorite-structured heterovalent PbF2:ScF3 and isovalent PbF2:MF2 (M = Mg, Ba, Cd) concentrated solid solutions were prepared as single crystals in a broad concentration range. In the eutectic systems, PbF2-MgF2 and PbF2-ScF3, the eutectic and near-eutectic composites were prepared from the melt. Saturated solid solutions of each system form two phases of these composites. The fast ionic conductivity, static permittivity and microstructure of both the single crystals and the composites are examined. Fastest ionic conductivity, with a conduction enthalpy of 0.389 eV, is found in PbF2:7 m/o ScF3 solid electrolyte. In this material, the fluoride ion conductivity at 500 K is equal to 0.13 S/cm. Plausible models of defect structures and conduction mechanisms are proposed for all examined systems. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：181 / 189

页数：9

共 19 条

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