Abstract
Proton concentration of La1.9Ca0.1Zr2O7−α in H2O–O2 atmospheres has been measured by means of the method of high temperature thermogravimetry. The oxygen diffusion coefficient and the oxygen surface exchange coefficient have been measured for La1.9Ca0.1Zr2O7−α over the temperature range of 600–900°C using the oxygen isotope exchange method with gas phase equilibration. pO2-dependencies of the electrical conductivity have been determined in the temperature range 500–800°C and oxygen partial pressure range of 10−20<pO2<0.21atm in atmosphere saturated with water vapour at 25 °С (pН2О=0.03atm). Ionic conductivity has been divided into protonic and oxygen-ionic components. The influence of oxygen defect structure on the water uptake, oxygen diffusivity and electrical conductivity of La1.9Ca0.1Zr2O7−α has been discussed.
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