TY - JOUR
T1 - Oxygen nonstoichiometry and transport properties of LaNi0.6Co0.4O3−δ
AU - Budiman, R. A.
AU - Uzumaki, Y.
AU - Hong, H. J.
AU - Miyazaki, T.
AU - Hashimoto, S.
AU - Nakamura, T.
AU - Yashiro, K.
AU - Amezawa, K.
AU - Kawada, T.
N1 - Funding Information:
This work was supported by JST, Japan , as part of “Phase Interface Science for Highly Efficient Energy Utilization” project in strategic basic research program, CREST.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016
Y1 - 2016
N2 - The oxygen nonstoichiometry of the perovskite-type oxide, LaNi0.6Co0.4O3−δ, was measured at various temperatures and oxygen partial pressures (p(O2)) by high temperature gravimetry and coulometric titration. The oxygen nonstoichiometry appeared independent of p(O2) in the range of 10− 4 bar > p(O2), which was in good agreement with the tendency of lattice parameter determined by the high-temperature X-ray diffraction (HT-XRD). The oxygen nonstoichiometry behavior was analyzed using the defect equilibrium model assuming delocalized electron. In addition, the diffusion coefficient, D*, and the surface reaction rate constant, k*, were obtained by the isotope exchange and secondary ion mass spectrometry. The Dv estimated from the D* showed similarity with those reported for other perovskite oxides which supported the reliability of δ determined in this work.
AB - The oxygen nonstoichiometry of the perovskite-type oxide, LaNi0.6Co0.4O3−δ, was measured at various temperatures and oxygen partial pressures (p(O2)) by high temperature gravimetry and coulometric titration. The oxygen nonstoichiometry appeared independent of p(O2) in the range of 10− 4 bar > p(O2), which was in good agreement with the tendency of lattice parameter determined by the high-temperature X-ray diffraction (HT-XRD). The oxygen nonstoichiometry behavior was analyzed using the defect equilibrium model assuming delocalized electron. In addition, the diffusion coefficient, D*, and the surface reaction rate constant, k*, were obtained by the isotope exchange and secondary ion mass spectrometry. The Dv estimated from the D* showed similarity with those reported for other perovskite oxides which supported the reliability of δ determined in this work.
KW - Defect chemical
KW - Diffusion coefficient
KW - Oxygen nonstoichiometry
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U2 - 10.1016/j.ssi.2016.05.005
DO - 10.1016/j.ssi.2016.05.005
M3 - Article
AN - SCOPUS:84979743350
SN - 0167-2738
VL - 292
SP - 52
EP - 58
JO - Solid State Ionics
JF - Solid State Ionics
ER -