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Estimation of melting (decomposition) heat of some compounds in the Y−Ba−Cu−O system

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Abstract

A thermodynamical method for the estimation of decomposition heat in a crystal state, incongrous and congruous melting of compounds with the use of temperature dependencies of total entropies of compounds was suggested. Entropies and heats of phase transformation of YBa2Cu3O6, YBa2Cu3O7, YBa2Cu3.5O7.5, YBa2Cu4O8, YBa2Cu5O9, YBa4Cu3O8.5, Y2BaO4, Y2Ba2O5, Y2Ba4O7, Y4Ba3O9, YCuO2, Y2Cu2O5, Y2BaCu2O5, Ba2CuO3, BaCuO2, BaCu2O2, Ba3Cu5O8 were calculated. Data, obtained by the authors earlier, are discussed.

Zusammenfassung

Unter Zuhilfenahme der Temperaturabhängigkeit der Gesamtentropie von Verbindungen wird eine thermodynamische Methode zur Schätzung der Zersetzungswärme im kristallinen Zustand, beim inkongruenten und kongruenten Schmelzen von Verbindungen vorgeschlagen. Es wurden die Entropien und Phasenumwandlungswärmen von YBa2Cu3O6, YBa2Cu3O7, YBa2Cu3.5O7.5, YBa2Cu4O8, YBa2Cu5O9, YBa4Cu3O8.5, Y2BaO4, Y2Ba2O5, Y2Ba4O7, Y4Ba3O9, YCuO2, Y2Cu2O5, Y2BaCuO5, Ba2CuO3, BaCuO2, Bacu2O2, Ba3Cu5O8 berechnet. Frühere Angabe von anderen Autoren werden diskutiert.

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Authors and Affiliations

  1. Institute of Metallurgy, Ural Division of Russian Academy of Sciences, 101 Amundsen, GSP-812, 620219, Ekaterinburg, Russian Federation

    G. Moiseev, N. Vatolin &  J. Šesták

  2. Institute of Physics, Section of Solid State Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00, Prague 6, Czech Republic

    V. Šestáková

Authors
  1. G. Moiseev
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  2. N. Vatolin
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  3. J. Šesták
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  4. V. Šestáková
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Moiseev, G., Vatolin, N., Šesták, J. et al. Estimation of melting (decomposition) heat of some compounds in the Y−Ba−Cu−O system. Journal of Thermal Analysis 43, 477–488 (1995). https://doi.org/10.1007/BF02546836

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