Water vapor absorption and proton conductivity of (Ba1−xLax)2In2O5+x
2006
Kakinuma, Katsuyoshi | Tomita, Aya | Yamamura, Hiroshi | Atake, Tooru
The proton conductivity of (Ba₁₋ₓLaₓ)₂In₂O₅₊ₓ system has been investigated as a function of the La content, temperature and amount of absorbed water. The proton conductivity increased with La content up to x = 0.10, to reach a maximum of 1.12 × 10⁻⁵ (S/cm) at 400 °C. From that point on, it decreased. From the results of thermogravimetry and mass spectra, we confirmed that the water was absorbed in the (Ba₁₋ₓLaₓ)₂In₂O₅₊ₓ system, in a maximum quantity of 0.14 mol/mol (sample). The proton conductivity increased monotonically with the quantity of water uptake, suggesting that this variable is one of the dominant parameter of proton conductivity in this system.
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