Gibbs Free Energy of Formation ofLn2CuBaO5Compounds Determined by the EMF Method (Ln=Yb, Tm, Er, Ho, Dy, and Gd)

Gibbs free energy of formation of a solid Sm2CuBaO5phase determined by an e.m.f. method

“…Also, enthalpy terms obtained for other lanthanide phases ranging from Yb 2 CuBaO 5 to Gd 2 CuBaO 5 are all similar. (4) The comparison of the enthalpy values gathered so far, shown in figure 5, reveals the general trend with the change of ionic radius of the lanthanide element along the row of the periodic table. The plot indicates that the enthalpy becomes more negative as the lanthanide element changes from ytterbium to samarium, i.e.…”

“…(7) The cell construction in this study followed that used by Alcock and Li (8) in the study of the thermodynamic properties of (copper + strontium + oxygen), and has been applied in our previous research. (4,5) The electrochemical cell used in this work is schematically shown in figure 3.…”

“…the element next to Eu, have been investigated by using the same technique based on an electrochemical cell with CaF 2 solid electrolyte. Electrochemical cells with zirconia solid electrolyte were also used to determine the Gibbs free energy of formation of CuSm 2 O 4 and CuSmO 2 phases in the ternary (copper + samarium + oxygen) system.…”

“…(3) Next, the Gibbs free energy of formation of 2,1,1 phases with Yb, Tm, Er, Ho, Dy, and Gd were determined by using an electrochemical method. (4) Finally, the Gibbs free energy of formation of the 1,2,3 phase was measured. (5) In this paper, the thermodynamic properties of the Sm (2,1,1) phase, i.e.…”

Thermodynamic properties of RE2BaCuO5 (RE=Gd, Dy)

“…The thermodynamic properties of RE 2 BaCuO 5 (RE = Gd, Dy) were studied earlier by the electromotive force (EMF) method with a fluoride-ion electrolyte [3]. The enthalpy of formation of Gd-211 from oxides at 323.15 K was measured by Matskevich to be −75.0 kJ mol −1 [4].…”