H/D Isotope Effect in the Conductivity of CaZr1 – xScxO3 – α in Reducing Atmospheres
The ionic (proton and deuteron) conductivity of the system CaZr1 – xScxO3 – α (x = 0.03–0.20) is studied experimentally in H2 + H2O + N2 and D2 + D2O + N2 reducing atmospheres at pH2O = pD2O = 3.2 kPa and in the temperature range of 600–900°C. This system exhibits a considerable H/D isotopic effect in conductivity, and its magnitude is estimated. Using theoretical elaborations, we also estimate the magnitude of the thermodynamic isotope effect in the solubility of H2O/D2O in the considered system under reducing conditions.
The work was partially supported by the Ural Branch of the Russian Academy of Sciences (project no. 18-10-3-11).
In this work, we used facilities of the Shared Access Center “Composition of Compounds,” the Institute of High-Temperature Electrochemistry, the Ural Branch of the Russian Academy of Sciences.
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