Oxygen Nonstoichiometry of (Nd2/3Ce1/3)4(Ba2/3Nd1/3)4Cu6O16+x

The equilibrium oxygen content of (Nd2/3Ce1/3)4(Ba2/3 Nd1/3)4Cu6O16+x was measured by coulomeric titration in the temperature range 550-820°C and at oxygen pressures between 10-3 and 1 atm. From the results, the partial molar enthalpy and entropy of oxygen were calculated as functions of the oxygen...

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Bibliographic Details
Published in:Journal of solid state chemistry 1995-11, Vol.120 (1), p.146-150
Main Authors: Patrakeev, M.V., Leonidov, I.A., Lakhtin, A.A., Kozhevnikov, V.L., Nikolaev, A.V.
Format: Article
Language:English
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Summary:The equilibrium oxygen content of (Nd2/3Ce1/3)4(Ba2/3 Nd1/3)4Cu6O16+x was measured by coulomeric titration in the temperature range 550-820°C and at oxygen pressures between 10-3 and 1 atm. From the results, the partial molar enthalpy and entropy of oxygen were calculated as functions of the oxygen content. The data were explained based on a point defects model and the equilibrium constants of the redox and charge disproportionation reactions involved were derived. A phase transition near the point x ≈ 1.83, which nominally corresponds to one trivalent copper cation per elementary unit, was observed.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1995.1389