Oxygen permeation, electrical conductivity and stability of the perovskite oxide La0.2Sr0.8Cu0.4Co0.6O3-x

被引:64
作者
Kim, S [1 ]
Yang, YL [1 ]
Christoffersen, R [1 ]
Jacobson, AJ [1 ]
机构
[1] Univ Houston, Dept Chem, Houston, TX 77204 USA
关键词
oxygen permeation; perovskite oxide; mixed conductivity; La0.2Sr0.8Cu0.4Co0.6O3-x;
D O I
10.1016/S0167-2738(97)00427-X
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 cubic perovskite La0.2Sr0.8Cu0.4Co0.6O3-x has high electronic and ionic conductivity at high temperatures. The electronic conductivity initially increases with increasing temperature but then decreases due to loss of oxygen atoms from the structure. The oxygen permeability measured on disc membranes is comparable to values reported for other cobalt-containing perovskite oxides with high strontium content. The permeation flux decreases with time due to a transformation of the disordered cubic perovskite to an ordered structure related to Brownmillerite. This ordered structure is stable below 975 degrees C in an oxygen partial pressure pO(2) = 0.01 atm. Membranes that have been maintained at high temperature in an oxygen partial pressure gradient for >400 h show decomposition to a multi-phase assemblage that includes non-perovskite strontium cuprates. This decomposition may also contribute to the flux decline.
引用
收藏
页码:57 / 65
页数:9
相关论文
共 21 条
[1]   LOCAL-STRUCTURE AND OXIDE-ION MOTION IN DEFECTIVE PEROVSKITES [J].
ADLER, S ;
RUSSEK, S ;
REIMER, J ;
FENDORF, M ;
STACY, A ;
HUANG, QZ ;
SANTORO, A ;
LYNN, J ;
BALTISBERGER, J ;
WERNER, U .
SOLID STATE IONICS, 1994, 68 (3-4) :193-211
[2]   Dense ceramic membranes for partial oxidation of methane to syngas [J].
Balachandran, U ;
Dusek, JT ;
Mieville, RL ;
Poeppel, RB ;
Kleefisch, MS ;
Pei, S ;
Kobylinski, TP ;
Udovich, CA ;
Bose, AC .
APPLIED CATALYSIS A-GENERAL, 1995, 133 (01) :19-29
[3]   STUDIES OF SMALL-POLARON MOTION .4. ADIABATIC THEORY OF HALL EFFECT [J].
EMIN, D ;
HOLSTEIN, T .
ANNALS OF PHYSICS, 1969, 53 (03) :439-&
[4]   ON THE CUBIC PEROVSKITES LA(0.2)SR(0.8)CU(0.4)M(0.6)O(3-Y)(M=CO, FE) [J].
GENOUEL, R ;
MICHEL, C ;
NGUYEN, N ;
STUDER, F ;
HERVIEU, M ;
RAVEAU, B .
JOURNAL OF SOLID STATE CHEMISTRY, 1995, 119 (02) :260-270
[5]  
HARRISON WTA, 1995, MAT RES B, V30, P237
[6]   LOCALIZED LEVEL HOPPING TRANSPORT IN LA(SR)CRO3 [J].
KARIM, DP ;
ALDRED, AT .
PHYSICAL REVIEW B, 1979, 20 (06) :2255-2263
[7]   INFLUENCE OF ORDER-DISORDER TRANSITIONS ON OXYGEN PERMEABILITY THROUGH SELECTED NONSTOICHIOMETRIC PEROVSKITE-TYPE OXIDES [J].
KRUIDHOF, H ;
BOUWMEESTER, HJM ;
VONDOORN, RHE ;
BURGGRAAF, AJ .
SOLID STATE IONICS, 1993, 63-5 :816-822
[8]   A thermogravimetric study of the phase diagram of strontium cobalt iron oxide, SrCo0.8Fe0.2O3-delta [J].
Liu, LM ;
Lee, TH ;
Qiu, L ;
Yang, YL ;
Jacobson, AJ .
MATERIALS RESEARCH BULLETIN, 1996, 31 (01) :29-35
[9]   DEMIXING OF DOPED OXIDES - INFLUENCE OF DEFECT INTERACTIONS [J].
MARTIN, M ;
SCHMACKPFEFFER, R .
SOLID STATE IONICS, 1994, 72 :67-71
[10]   OXYGEN PERMEATION STUDIES OF SRCO0.8FE0.2O3-DELTA [J].
QIU, L ;
LEE, TH ;
LIU, LM ;
YANG, YL ;
JACOBSON, AJ .
SOLID STATE IONICS, 1995, 76 (3-4) :321-329