Redox energetics of SrFeO3-δ -: a coulometric titration study

被引:41
作者
Bakken, E
Stolen, S
Norby, T
Glenne, R
Budd, M
机构
[1] Univ Oslo, Dept Chem, N-0315 Oslo, Norway
[2] Renewable Energy Corp, N-1323 Hovik, Norway
[3] Norsk Hydro AS, Res Ctr, N-3907 Porsgrunn, Norway
关键词
SrFeO3-delta; redox energetics; integral Gibbs energy models; defect-defect interactions; coulometric titration;
D O I
10.1016/j.ssi.2004.01.014
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 variation of the oxygen non-stoichiometry (3-delta) in SrFeO3-delta with the partial pressure of oxygen was measured by coulometric titration at 1223, 1248 and 1273 K. An electrochemical cell that could be heated and cooled repeatedly without introducing leakages was developed for the experiments. The Gibbs energy, the standard entropy and the partial molar enthalpy and entropy of oxygen of SrFeO3-delta are derived from the measured isotherms and compared with earlier reported data. Solid solution models are presented and used in the analysis of the observed redox properties. It is shown that the redox properties can be interpreted by a non-ideal solution model that includes excess configurational entropy as the only excess term. A reduced structural disorder on the O-sub-lattice is suggested from the formation of preferred structural entities such as FeO6-octahedra, FeO5-square pyramids and FeO4-tetrahedra. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:367 / 377
页数:11
相关论文
共 20 条
[1]   Order-disorder in grossly non-stoichiometric SrFeO2.50 -: a simulation study [J].
Bakken, E ;
Allan, NL ;
Barron, THK ;
Mohn, CE ;
Todorov, IT ;
Stolen, S .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (11) :2237-2243
[2]   Redox energetics of perovskite-related oxides [J].
Bakken, E ;
Norby, T ;
Stolen, S .
JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (02) :317-323
[3]  
Barin I., 2008, Thermochemical Data of Pure Substances, VThird
[4]   HIGH-TEMPERATURE MOSSBAUER-SPECTROSCOPY OF SOME SRFEO3-Y PHASES [J].
FOURNES, L ;
POTIN, Y ;
GRENIER, JC ;
DEMAZEAU, G ;
POUCHARD, M .
SOLID STATE COMMUNICATIONS, 1987, 62 (04) :239-244
[5]  
GLENNE R, 2001, THESIS NORWEGIAN U S
[6]   STRUCTURAL TRANSITIONS AT HIGH-TEMPERATURE IN SR2FE2O5 [J].
GRENIER, JC ;
EA, N ;
POUCHARD, M ;
HAGENMULLER, P .
JOURNAL OF SOLID STATE CHEMISTRY, 1985, 58 (02) :243-252
[7]   On the enthalpic contribution to the redox energetics of SrFeO3-δ [J].
Haavik, C ;
Atake, T ;
Stolen, S .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2002, 4 (06) :1082-1087
[8]   On the entropic contribution to the redox energetics of SrFeO3-δ [J].
Haavik, C ;
Atake, T ;
Kawaji, H ;
Stolen, S .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2001, 3 (17) :3863-3870
[9]   Evolution of oxygen-vacancy ordered crystal structures in the perovskite series SrnFenO3n-1 (n=2, 4, 8, and ∞), and the relationship to electronic and magnetic properties [J].
Hodges, JP ;
Short, S ;
Jorgensen, JD ;
Xiong, X ;
Dabrowski, B ;
Mini, SM ;
Kimball, CW .
JOURNAL OF SOLID STATE CHEMISTRY, 2000, 151 (02) :190-209
[10]   Defects And Transport In SrFe1-xCOxO3-δ [J].
Holt, A. ;
Norby, T. ;
Glenne, R. .
IONICS, 1999, 5 (5-6) :434-443