Thermodynamic Properties and Stability of In‐Doped SrCeO₃ Proton‐Conducting Ceramics

Calorimetric investigation of new Bi12.5Dy1.5ReO24.5 phase

“…Since the direction of any chemical transformations is determined by the sign of Gibbs energy, DG = DHÀTDS, the value of enthalpy change D r H 5 is not sufficient to evaluate whether the reaction (5) takes place at room temperature or not. It was shown for a number of triple oxides [16,17] that the term DS was close to zero for the formation of triple oxides from binary oxides. Therefore, estimating the entropy of Bi 12.5-Dy 1.5 ReO 24.5 as entropy of 6.25Bi 2 O 3 + 0.75Dy 2 O 3 + 0.5Re 2 O 7 mixture, in our case it is possible to speak about the stability of Bi 12.5 Dy 1.5 ReO 24.5 on the basis of the reaction enthalpy sign.…”