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Calorimetric study and stability of Y202 phase in the Y–Ba–Cu–O system

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Abstract

The thermodynamic stability of Y202 phase has been studied at room temperature. For this reason, we have measured the standard formation enthalpy and enthalpy from binary oxides of yttrium cuprate by solution calorimetry combining solution enthalpies of Y2Cu2O5 and Y2O3 + 2CuO mixture in 6 M HCl at 323.15 K and literature data. Also Y2Cu2O5 heat capacity has been obtained by adiabatic calorimetry in the temperature range of 8–303 K. Smoothed values of heat capacities, entropies, and enthalpies have been calculated on the basis of experimental data. Basing on the measured data, the Gibbs free energy for decomposing yttrium cuprate into binary oxides has been calculated at room temperature. It has been established that Y202 phase is thermodynamically unstable with respect to its decomposition into binary oxides at room temperature.

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Acknowledgements

This work was particularly supported by the Russian Fund of Basic Research (Project 13-08-00169).

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3, Lavrentiev Pr., 630090, Novosibirsk, Russian Federation

    N. I. Matskevich & G. A. Berezovskii

  2. INFN, Sezione di Roma Tor Vergata, 00133, Rome, Italy

    Yu. F. Minenkov

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  1. N. I. Matskevich
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  2. Yu. F. Minenkov
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  3. G. A. Berezovskii
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Correspondence to N. I. Matskevich.

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Matskevich, N.I., Minenkov, Y.F. & Berezovskii, G.A. Calorimetric study and stability of Y202 phase in the Y–Ba–Cu–O system. J Therm Anal Calorim 121, 771–776 (2015). https://doi.org/10.1007/s10973-015-4599-8

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  • DOI: https://doi.org/10.1007/s10973-015-4599-8

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