Effects of tungsten substitution on the transport properties and mechanism of fast oxide-ion conduction in La2Mo2O9

被引：62
作者：
Georges, S.
Bohnke, O.
Goutenoire, F.
Laligant, Y.
Fouletier, J.
Lacorre, P. [1 ]
机构：
[1] Univ Maine, CNRS, UMR 6010, Lab Oxydes & Fluorures, F-72085 Le Mans 9, France
[2] ENSEEG, CNRS, UMR 5631, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres, France
来源：
SOLID STATE IONICS | 2006年 / 177卷 / 19-25期
关键词：
anion conductors; impedance spectroscopy; static to dynamic disorder transition; stability under low oxygen pressure; activated Arrhenius transport; assisted VTF-type transport;
D O I：
10.1016/j.ssi.2006.02.036
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 oxide-ion conduction properties of the series La2Mo2-yWyO9 (y <= 1.4) are studied by impedance spectroscopy. For each studied composition (y = 0.25, 0.5, 0.75, 1.0, 1.2 and 1.4) two conduction regimes are evidenced: a low temperature regime of conventional Arrhenius-type, and a high temperature regime interpreted as VTF (Vogel-Tammann-Fulcher)-type, with highly mobile oxide-ions. While the characteristics of the Arrhenius-type regime evolve regularly with tungsten substitution, those of the VTF-type regime vary non linearly, with an extremum, at y = 1. Both findings are analyzed in connection with similar trends previously evidenced in a crystallographic study [G. Corbel, Y Laligant, F. Goutenoire, E. Suard, P. Lacorre, Chem. Mater. 17 (2005) 4678], namely smooth evolution of O2/O3 sites occupancy, and non linear evolution of the cell volume and cationic framework characteristics, respectively. The best performance in term of conduction stability in a reducing atmosphere is obtained for doubly substituted La1.7Gd0.3Mo0.8W1.2O9 (stable at 696 degrees C down to P(O-2)= 1.6 10(-16) Pa). (c) 2006 Elsevier B.V. All rights reserved.
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页码：1715 / 1720
页数：6
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