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The system Yb–Ru–O: High temperature studies on the oxides Yb2Ru2O7(s) and Yb3RuO7(s)

Publication date:

15 October 2013


Source:Materials Chemistry and Physics, Volume 142, Issue 1

Author(s): Aparna Banerjee , Ziley Singh Chaudhary

The standard molar Gibbs free energy of formation of Yb2Ru2O7(s) and Yb3RuO7(s) was determined using an oxide solid-state electrochemical cell wherein calcia-stabilized-zirconia (CSZ) was used as an electrolyte. The standard molar Gibbs free energy of formation of Yb2Ru2O7(s) and Yb3RuO7(s) from elements in their standard state was calculated by the least squares regression analysis of the data obtained in the present study and can be given respectively by: {Δf G°(Yb2Ru2O7, s)/(kJ mol−1) ± 1.88} = −2450.4 + 0.6025·(T/K) and {Δf G°(Yb3RuO7, s)/(kJ mol−1) ± 2.36} = −3109.6 + 0.6202·(T/K). Standard molar heat capacity C°p,m(T) of Yb2Ru2O7(s), was measured using a heat flux type differential scanning calorimeter (DSC) in the temperature range from 307 K to 845 K. The heat capacity of Yb2Ru2O7(s) was used along with the data obtained from the oxide electrochemical cell to calculate the standard enthalpy of formation of the compound Yb2Ru2O7(s), from elements at 298.15 K.





Authors:   Author(s): Aparna Banerjee , Ziley Singh Chaudhary
Journal:   Materials Chemistry and Physics
Year:   2013
Publication date:   02-Sep-2013
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