Thermodynamic study of Ba3CuO4 (s) in Ba-Cu-O system
2019
Abstract Ba 3 CuO 4 (s) is one of the important compounds as a proton conducting electrolyte which form due to interaction of BaO and CuO. In the present study, Ba 3 CuO 4 (s) has been synthesized by solid state route and the Gibbs energy of formation and heat capacity has been experimentally measured by Knudsen Effusion Mass Spectrometer and differential scanning calorimeter. The Δ G f (Ba 3 CuO 4 , s, T ) and C ° p (Ba 3 CuO 4 , s, T ) is obtained as per given equations: Δ G f (Ba 3 CuO 4 , s, T ) ± 7 / kJ mol −1 = −1888 + 0.4229.( T / K) C° p (Ba 3 CuO 4 , s, T )(J K −1 mol −1 ) ± 6 = 211 + 0.0274·( T /K) – 3039600.( T /K) −2 The binary phase diagram of BaO-CuO system has been calculated based on the Gibbs energy minimization method. Using the experimental thermodynamic data, isothermal chemical potential diagram of Ba-Cu-C-O system with different axial parameter and ternary phase diagram of Ba (s) - Cu (s) - O 2 (g) system has been calculated in order to study the thermodynamic stability and coexisting phases of Ba 3 CuO 4 (s).
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