Open AccessThe changes of Ba0.5Sr0.5Co0.8Fe0.2O3-δ perovskite oxide on heating in oxygen and carbon dioxide atmospheres
Author(s) -
Saša Zeljković,
Toni Ivas,
S. Vaucher,
Dijana Jelić,
Ludwig J. Gauckler
Publication year - 2014
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc131024018z
Subject(s) - thermogravimetry , perovskite (structure) , partial pressure , oxygen , carbon dioxide , atmospheric temperature range , oxide , chemistry , reactivity (psychology) , oxygen pressure , inorganic chemistry , materials science , analytical chemistry (journal) , thermodynamics , environmental chemistry , crystallography , organic chemistry , medicine , physics , alternative medicine , pathology
In the first part of this study, the oxygen deficiency, δ, in Ba0.5Sr0.5Co0.8Fe0.2O3 - δ (BSCF) was measured by means of thermogravimetry as a function of oxygen partial pressure, p(O2), in the range of 1.1×10−6 < p(O2)/% < 41.67 at elevated temperatures ranging 873 ≤ T/K ≤ 1073. It was shown that δ becomes more pronounced with increasing T and with decreasing p(O2). The isotherms δ vs. p(O2) were determined. The second part of this study relates to the reaction of CO2 with Ba0.5Sr0.5Co0.8Fe0.8O3-δ perovskite oxide in the absence and presence of O2 at temperatures ranging from 673 to 973 K also by thermogravimetry. The reactivity of CO2 with BSCF increased with increasing temperature and increasing exposure to CO2. Reaction of CO2 with BSCF was described by a equilibrium reaction isotherms. The results of X-ray diffractometry evidenced that the exposure to CO2 leads to the formation of carbonates