Author(s):
1. Jelena Penavin-Škundrić, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Saša Zeljković, Republic of Srpska, Bosnia and Herzegovina

Abstract:
The oxygen non-stoichiometry, δ, of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ was measured by means of thermogravimetry as a function of oxygen partial pressure in the range of 1.1×10−6 < pO2/% < 41.67 at elevated temperatures (873 ≤ T/K ≤ 1073) and compared with all the reported values. Ba0.5Sr0.5Co0.8Fe0.2O3 − δ shows the oxygen deficient composition depending on p(O2) and temperature. In Ba0.5Sr0.5Co0.8Fe0.2O3 − δ, δ becomes larger with increasing T and with decreasing p(O2). At the same p(O2), δ of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ increases with increasing T. By applying CALPHAD method model of defect chemistry is proposed to explain oxygen non-stoichiometry of the BSCF phase. The non-stoichiometry curves were reproduced well by the proposed defect model and the obtained thermodynamic parameters.

Key words:
Ba0.5Sr0.5Co0.8Fe0.2O3 – δ (BSCF), Oxygen non-stoichiometry, Modelling, Perovskite

Thematic field:
Istraživanje novih materijala

Opening paper:
Yes

Date of abstract submission:
30.05.2011.

Number of visits:
726

Conference:
Contemporary Materials - 2011 - Savremeni materijali