Hard X-ray Fluorescence Measurements of Heteroepitaxial Solid Oxide Fuel Cell Cathode Materials

被引：7

作者：

Davis, J. N. ^{[1
]}

Miara, L. J. ^{[1
]}

Saraf, L. ^{[3
]}

Kaspar, T. C. ^{[3
]}

Gopalan, S. ^{[1
,2
]}

Pal, U. B. ^{[1
,2
]}

Woicik, J. C. ^{[4
]}

Basu, S. N. ^{[1
,2
]}

Ludwig, K. F. ^{[1
,3
,5
]}

机构：

[1] Boston Univ, Div Mat Sci & Engn, Brookline, MA 02446 USA

[2] Boston Univ, Dept Mech Engn, Boston, MA 02215 USA

[3] PNNL, Environm Mol Sci Lab, Richland, WA 99352 USA

[4] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[5] Boston Univ, Dept Phys, Boston, MA 02215 USA

来源：

BATTERY/ENERGY TECHNOLOGY (GENERAL) - 220TH ECS MEETING | 2012年 / 41卷 / 11期

关键词：

D O I：

10.1149/1.3687387

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Strontium doped lanthanum manganite (La0.8Sr0.2)(0.95)MnO3 (LSM) and lanthanum strontium cobalt ferrite La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) thin films were grown by pulsed laser deposition (PLD) on single crystal substrates. Total X-ray Reflection Fluorescence (TXRF) reveals the evolution of surface composition due to annealing at 800 degrees C. X-ray Absorption Near Edge Spectroscopy (XANES) provides insight into the local electronic structure of the cations. LSM manganese concentration is higher at the surface than in the bulk in as-deposited films. Annealing further enhances surface manganese segregation and irreversibly changes the manganese XANES spectra. Surface strontium is greatly enhanced in LSCF samples quenched from 800 degrees C, however the strontium is reabsorbed into the film when allowed to cool slowly.

引用

页码：19 / 24

页数：6