Oxygen content and thermodynamic stability of YBaCo4O7±δ

Oxygen content and thermodynamic stability of YBaCo4O7±δ 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

Oxygen content and thermodynamic stability of YBaCo4O7±δ

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.05.004
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • J. Solid State Chem.
    Chmaissem, O.; Zheng, H.; Huq, A.; Stephens, P.W.; Mitchell, J.F.
  • Eur. J. Inorg. Chem.
    Parkkima, O.; Karppinen, M.

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