Thermal expansion behavior of La-doped (Ba0.5Sr0.5Co0.8Fe0.2)O3−δ cathode material
Source abstract
Abstract
Abstract In this study, the thermal expansion behavior of the BSCF (Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ ) and La-doped BSCF, i.e., (Ba 0.5 Sr 0.5 ) 0.7 La 0.3 Co 0.8 Fe 0.2 O 3− δ (BSLCF30) was systematically examined. The thermal expansion rate of the sintered body increased rapidly at around 500 °C. It was found from the TG analysis that the oxygen vacancies formed around this temperature. When La is doped in the A-site of BSCF, more weight loss was observed over 500 °C compared to BSCF, which shows that La doping induces oxygen vacancies. Consequently, chemical expansion of the B-site cations occurred. Therefore, the thermal expansion coefficient (TEC) of BSLCF was much bigger than that of the BSCF. When the samples were heated and cooled in an Ar atmosphere, hysteresis of TEC was observed since re-oxidation cannot occur during cooling.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
Show source-provided references
1. Singhal · 2003 · 1
2. Chemical and thermomechanical compatibility between Ni-GDC anode and electrolytes based on ceria10.1016/j.ceramint.2008.03.004 ↗
3. Phase stability and conductivity of Ba1−ySryCe1−xYxO3−d solid oxide fuel cell electrolyte10.1016/j.jpowsour.2009.02.061 ↗
4. Cathode materials for solid oxide fuel cells: a review10.1007/s10008-009-0932-0 ↗
5. Nanostructured LSM/YSZ composite cathodes for IT-SOFC: a comprehensive microstructural study by electrostatic spray deposition10.1016/j.ssi.2008.05.006 ↗
6. High power-density single-chamber fuel cells operated on methane10.1016/j.jpowsour.2006.07.003 ↗
7. Partial oxidation of methane in Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane reactor at high pressures10.1016/j.cattod.2005.03.078 ↗
8. Performance of functional perovskite membranes for oxygen production10.1016/j.memsci.2005.09.046 ↗
9. Electrochemical performance of (Ba0.5Sr0.5)0.9Sm0.1Co0.8Fe0.2O3−δ as an intermediate temperature solid oxide fuel cell cathode10.1016/j.jpowsour.2006.11.022 ↗
10. Thermal, electrical, and electrocatalytical properties of lanthanum-doped strontium titanate10.1016/S0167-2738(02)00140-6 ↗
11. Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5Co0.8Fe0.2O3−δ10.1016/j.jpcs.2007.04.014 ↗
12. Oxygen-transport and exchange in oxide ceramics10.1016/0378-7753(93)01789-K ↗
13. Thermal and isothermal expansion
14. Oxygen stoichiometry and chemical expansion of Ba0.5Sr0.5Co0.8Fe0.2O3−δ measured by in situ neutron diffraction10.1021/cm052763x ↗
15. Oxygen stoichiometry and expansion behavior of Ba0.5Sr0.5Co0.8Fe0.2O3−δ10.1016/j.ssi.2009.11.012 ↗
16. Preparation and sintering of nanocrystalline ITO powders with different SnO2 content10.1016/j.jeurceramsoc.2004.10.009 ↗
17. Structure and electrical properties of La1−xSrxCo1−yFeyO3. Part 1: the system La0.8Sr0.2Co1−yFeyO310.1016/0167-2738(94)00244-M ↗
18. The perovskite oxide system Pr1−xSrxCo1−yMnyO3−δ: crystal structure and thermal expansion10.1016/S0955-2219(98)00169-1 ↗
19. Oxygen ionic transport in SrFe1−yAlyO3−δ and Sr1−xCaxFe0.5Al0.5O3−δ ceramics10.1016/j.jeurceramsoc.2004.03.011 ↗
20. Local structure of BaFeO3−δ studied by neutron scattering10.1016/S0921-4526(02)02571-1 ↗
21. SrFeO3−δ perovskite oxides: chemical features and performance for methane combustion10.1021/cm011292l ↗
22. Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials10.1016/j.apsusc.2007.09.063 ↗
23. X-ray photoelectron (XPS) and Diffuse Reflectance Infra Fourier Transformation (DRIFT) study of Ba0.5Sr0.5CoxFe1−xO3−δ (BSCF: x=0–0.8) ceramics10.1016/j.jssc.2011.06.016 ↗
24. X-ray photoelectron study on Ba0.5Sr0.5CoxFe1−xO3−δ (BSCF: x=0.2 and 0.8) ceramics annealed at different temperature and pO210.1007/s10853-011-5704-4 ↗
25. Merino · Applied Surface Science · 2006 · 253 · 148910.1016/j.apsusc.2006.02.035 ↗
26. Rousseau · Applied Catalysis B · 2009 · 88 · 43810.1016/j.apcatb.2008.10.022 ↗