Investigation of proton conductivity in Sm1.92Ca0.08Ti2O7-δ and Sm2Ti1.92Y0.08O7-δ pyrochlores

被引：27

作者：

Eurenius, K. E. J. ^{[1
]}

Ahlberg, E. ^{[1
]}

Ahmed, I. ^{[2
]}

Eriksson, S. G. ^{[2
]}

Knee, C. S. ^{[1
]}

机构：

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

[2] Chalmers Univ Technol, Dept Environm Inorgan Chem, SE-41296 Gothenburg, Sweden

来源：

SOLID STATE IONICS | 2010年 / 181卷 / 3-4期

关键词：

Sm2Ti2O7; Pyrochlore; Ionic conductivity; Infrared spectroscopy; Impedance spectroscopy; CA2+-DOPED LA2ZR2O7;

D O I：

10.1016/j.ssi.2009.05.004

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 results of the synthesis and characterisation of pyrochlore systems Sm1.92Ca0.08Ti2O7-delta and Sm2Ti1.92Y0.08O7-delta are reported. The electrical conductivity of the materials was studied using impedance spectroscopy under wet and dry oxygen and argon. Enhancements of the bulk conductivity at temperatures up to 500 degrees C were observed for wet conditions indicative of significant proton conductivity. The presence of dissolved protons in the materials is supported by thermogravimetric analysis and infrared spectroscopy. Proton conduction was confirmed by measurements in O-2/D2O and Ar/D2O. The results reveal the importance of the correct choice of dopant site for the pyrochlore structure, with A-site substitution yielding the highest levels of proton, as well as oxide ion, conduction. For both samples bulk, rather than grain boundary, conduction is found to be dominant. (C) 2009 Elsevier BM. All rights reserved.

引用

页码：148 / 153

页数：6

共 24 条

[11] Aspects of the formation and mobility of protonic charge carriers and the stability of perovskite-type oxides [J].

Kreuer, KD .

SOLID STATE IONICS, 1999, 125 (1-4) :285-302

[12] Proton conducting alkaline earth zirconates and titanates for high drain electrochemical applications [J].

Kreuer, KD ;

Adams, S ;

Münch, W ;

Fuchs, A ;

Klock, U ;

Maier, J .

SOLID STATE IONICS, 2001, 145 (1-4) :295-306

[13] Protonic conduction in La2Zr2O7-based pyrochlore materials [J].

Labrincha, JA ;

Frade, JR ;

Marques, FMB .

SOLID STATE IONICS, 1997, 99 (1-2) :33-40

[14]

Larson AC, 1994, GEN STRUCTURE ANAL S

[15] FAST HIGH-TEMPERATURE PROTON TRANSPORT IN NONSTOICHIOMETRIC MIXED PEROVSKITES [J].

LIANG, KC ;

DU, Y ;

NOWICK, AS .

SOLID STATE IONICS, 1994, 69 (02) :117-120

[16] High proton conductivity in barium yttrium stannate Ba2YSnO5.5 [J].

Murugaraj, P ;

Kreuer, KD ;

He, T ;

Schober, T ;

Maier, J .

SOLID STATE IONICS, 1997, 98 (1-2) :1-6

[17] Solid-state protonic conductors: principles, properties, progress and prospects [J].

Norby, T .

SOLID STATE IONICS, 1999, 125 (1-4) :1-11

[18] Water and hydrogen evolution properties and protonic conducting behaviors of Ca2+-doped La2Zr2O7 with a pyrochlore structure [J].

Omata, T ;

Okuda, K ;

Tsugimoto, S ;

Otsuka-Matsuo-Yao, S .

SOLID STATE IONICS, 1997, 104 (3-4) :249-258

[19] Effect of dopant species on the dissolving site of the protons in La2Zr2O7-doped with alkaline-earth ions [J].

Omata, T ;

Takagi, M ;

Otsuka-Yao-Matsuo, S .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (11) :E590-E594

[20] Infrared absorption spectra of high temperature proton conducting Ca2+-doped La2Zr2O7 [J].

Omata, T ;

Otsuka-Yao-Matsuo, S .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2001, 148 (12) :E475-E482

← 1 2 3 →