Аутори:
1. Jelena Penavin-Škundrić, Природно-математички факултет Бања Лука, Republic of Srpska, Bosnia and Herzegovina
2. Saša Zeljković, Republic of Srpska, Bosnia and Herzegovina

Апстракт:
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.

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

Тематска област:
Истраживање нових материјала

Уводни рад:
Да

Датум пријаве сажетка:
30.05.2011.

Бр. отварања:
726

Конференцијa:
Contemporary Materials - 2011 - Савремени материјали