Estimation of average heat capacities of condensed phase transformation products in the Y−Ba−Cu−O system |
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| Authors: | G Moiseev N Vatolin B Štępánek Prof Dr J Šesták |
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| Institution: | (1) Institute of Metallurgy, Ural Division of Russian Academy of Sciences, 101 Amundsen, GSP-812, 620219 Ekaterinburg, Russian Federation;(2) Institute of Physics, Section of Solid State Physics, Academy of Sciences of the Czech Republic, 162 00 Prague 6, Czech Republic;(3) Institute of Physics, Department of Semi-conductors, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Prague 6, Czech Republic |
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| Abstract: | A method of calculation of average heat capacities of phase transformation products of complex oxides is suggested. The method takes into account the physical state of products and the increase in the heat capacities of products due to the change of entropy at a phase transformation. Average heat capacities of products formed in a congruous melting of compounds (YCuO2 and Y4Ba3O9), in an incongruous melting of compounds (Y2Cu2O5, BaCuO2, BaCu2O2, Y2BaCuO5, YBa2Cu3O7, YBa2Cu3O6) and in a decomposition in a crystalline state of compounds (Y2BaO4, Y2Ba2O5, Y2Ba4O7, Ba2CuO3, Ba3Cu5O8, YBa2Cu3.5O7.5, YBa2Cu4O8, YBa2Cu5O9) was estimated by using three methods. |
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| Keywords: | heat capacity phase transformation Y− Ba− Cu− O system |
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