Crystal chemistry and phase equilibria studies of theBaO(BaCO3)R2O3CuOsystems. IV. Crystal chemistry and subsolidus phase relationship studies of the CuO-rich region of the ternary diagrams,R =lanthanides

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

“…It should be mentioned that the change in the Gibbs free energy of the net cell reaction [3] G "!2FE ' [7] is given by the identical expression as the change in the Gibbs free energy of the net cell reaction [5] …”

“…2. The corresponding linear relations between EMF and temperature are given in Table 1 together with respective G equations, calculated from relations [7] and [8], respectively. In a previous paper (12) we analyzed the literature data for the exchange reaction CaO#BaF "CaF #BaO [9] and accepted the change in Gibbs free energy as given by Kaye and Laby (13), which is G (J)"63,785!3.77 ¹ ($1000) [10] Combining reaction [9] with subsequent reactions [3] and [5] gives the reactionş…”

Phase Relations of the SrO–Ho2O3–CuOx System

“…(1,2,25) exists in the Sr systems as well. The ionic size of R> appears to be a dominant factor for determining the number of phases formed.…”

Gibbs Free Energy of Formation of Eu1+yBa2−yCu3O7−xand Related Phases in the Eu2O3–CuO–BaO System

“…The temperature was measured with a Pt-PtRh10 thermocouple. Dry, synthetic air (Linde, and the corresponding change in Gibbs free energy of reaction [1] is given by Germany), which was virtually water-free, was flowed con-…”