Phase stability of SrFeCo0.5Ox in reducing environments

被引：30

作者：

Ma, B ^{[1
]}

Balachandran, U ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA

来源：

MATERIALS RESEARCH BULLETIN | 1998年 / 33卷 / 02期

关键词：

ceramics; oxides; crystal structure; ionic conductivity; phase transitions;

D O I：

10.1016/S0025-5408(97)00214-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mixed-conducting SrFeCo0.5Ox is a potential material for use in dense ceramic membranes for gas separation at elevated temperatures. Its outstanding oxygen transport properties reveal the feasibility of using oxide ceramic membrane in large-scale oxygen separation. The stability of this material under low oxygen partial pressure is an important issue. To investigate phase and structural stability, SrFeCo0.5Ox samples were annealed in various reducing gaseous environments. The annealed samples were characterized by room-temperature X-ray powder diffraction and scanning electron microscopy analyses. In situ conductivity of the samples was measured in various atmospheres. Reversible phase transition related to the change of oxygen partial pressure in the surrounding atmosphere was observed at elevated temperatures. Our results show that mechanical failure of dense ceramic membranes made of this material may occur when it is cooled in a moisturized reducing atmosphere, such as hydrogen, and then reheated in an oxidizing atmosphere, such as air. (C) 1998 Elsevier Science Ltd.

引用

页码：223 / 236

页数：14

共 24 条

[1]

BALACHANDRAN U, 1995, AM CERAM SOC BULL, V74, P71

[2]

BALACHANDRAN U, 1997, 11 INT CRYOG S EN WE

[3]

BALACHANDRAN U, 1993, P COAL LIQ GAS CONV, V1, P138

[4] IMPORTANCE OF THE SURFACE EXCHANGE KINETICS AS RATE-LIMITING STEP IN OXYGEN PERMEATION THROUGH MIXED-CONDUCTING OXIDES [J].

BOUWMEESTER, HJM ;

KRUIDHOF, H ;

BURGGRAAF, AJ .

SOLID STATE IONICS, 1994, 72 (pt 2) :185-194

[5]

DICOSIMO R, 1992, J CATAL, V102, P377

[6]

Ganguly P., 1993, MATER SCI FORUM, V130-132, P493

[7] POWDER NEUTRON-DIFFRACTION INVESTIGATION OF NUCLEAR AND MAGNETIC-STRUCTURE OF SR2FE2O5 [J].

GREAVES, C ;

JACOBSON, AJ ;

TOFIELD, BC ;

FENDER, BEF .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1975, 31 (MAR15) :641-646

[8] PREPARATION AND INVESTIGATION OF SR2FE2O5 SINGLE-CRYSTALS - A CONTRIBUTION TO SOLID-STATE CHEMISTRY OF M2FE2O5 COMPOUNDS [J].

HARDER, M ;

MULLERBUSCHBAUM, H .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1980, 464 (05) :169-175

[9] DIFFUSION OF OXIDE ION VACANCIES IN PEROVSKITE-TYPE OXIDES [J].

ISHIGAKI, T ;

YAMAUCHI, S ;

KISHIO, K ;

MIZUSAKI, J ;

FUEKI, K .

JOURNAL OF SOLID STATE CHEMISTRY, 1988, 73 (01) :179-187

[10] HIGH-TEMPERATURE C1-GAS FUEL-CELLS USING PROTON-CONDUCTING SOLID ELECTROLYTES [J].

IWAHARA, H ;

UCHIDA, H ;

MORIMOTO, K ;

HOSOGI, S .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1989, 19 (03) :448-452

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