Intermediate temperature ionic conductivity of Sm1.92Ca0.08Ti2O7-δ pyrochlore

被引：8

作者：

Eurenius, Karinh E. J. ^{[2
]}

Bentzer, Henrik Karnoe ^{[1
]}

Bonanos, Nikolaos ^{[1
]}

Ahlberg, Elisabet ^{[2
]}

Knee, Christopher S. ^{[2
]}

机构：

[1] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Fuel Cells & Solid State Chem Div, DK-4000 Roskilde, Denmark

[2] Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2011年 / 15卷 / 11-12期

基金：

瑞典研究理事会;

关键词：

Proton conductor; Pyrochlore; Sm2Ti2O7; Concentration cell electromotive force method (EMF); Electrochemical impedance spectroscopy (EIS); Transport numbers; CA2+-DOPED LA2ZR2O7; PROTONIC CONDUCTION; GRAIN-BOUNDARIES; HYDROGEN; IMPEDANCE; CERAMICS; YB;

D O I：

10.1007/s10008-010-1235-1

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The results of concentration cell electromotive force methods (EMF) and electrochemical impedance spectroscopy measurements on the pyrochlore system Sm1.92Ca0.08Ti2O7-delta are presented. The data have been used to estimate total and partial conductivities and determine transport numbers for protons and oxide ions under various conditions. The EMF techniques employed include corrections for electrode polarisation resistance. The measurements were performed using wet and dry atmospheres in a wide p(O2)range using mixtures of H-2, N-2, O-2, and H2O in the temperature region where proton conductivity was expected (500-300 A degrees C). The impedance measurements revealed the conductivity to be mainly ionic under all conditions, with the highest total conductivity measured being 0.045 S/m under wet oxygen at 500 A degrees C. Both bulk and grain boundary conductivity was predominantly ionic, but electronic conductivity appeared to play a slightly larger part in the grain boundaries. EMF data confirmed the conductivity to be mainly ionic, with oxide ions being the major conducting species at 500 A degrees C and protons becoming increasingly important below this temperature.

引用

页码：2571 / 2579

页数：9

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