YBaCo4O7±δ was found to be thermodynamically stable in air at T>900°C whereas its thermodynamic stability at 950°C is limited by the range of oxygen partial pressures −5.05≤log(pO2/atm)≤−0.5. Oxygen content in YBaCo4O7±δ at 950°C slightly decreases from 7.009 at log(pO2/atm)=−0.5 to 6.953 in the atmosphere with log(pO2/atm)=−5.05. YBaCo4O7±δ decomposes into the mixture of YCoO3–δ, BaCoO3–δ and Co3O4 at 950°C in atmosphere with log(pO2/atm)>−0.5 whereas in atmosphere with log(pO2/atm)<−5.05 Y2BaCoO5, BaCoO2 and CoO were identified as the products of YBaCo4O7±δ decomposition.
Solid State Ionics – Elsevier
Published: Oct 1, 2015
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