The carbonatation of La 2 O 3 oxide and the decarbonatation of lanthanum carbonate phase La 2 O 2 CO 3 are investigated using thermal and thermogravimetry analyses under CO 2 gas flow. The initial phase La 2 O 3 is first elaborated from pyrolysis of a LaOHCO 3 precursor. Then, thermal and thermogravimetry analyses are carried out under CO 2 flow, as temperature increases then decreases. The carbonatation kinetics of La 2 O 3 is determined at three fixed temperatures. Electrical impedance spectroscopy is performed to determine the electrical responses associated with ionic mobilities and phase changes, in the temperature range 25 to900∘C. The electrical conduction during heating underCO2gas flow should be linked to two regimes of ionic conduction of the carbonate ions. From these electrical measurements, the ionic mobility of carbonate ionsCO3 2−is found to be close to 0.003 ⋅10−4 cm2 s−1 V−1at750∘C for the monoclinic La 2 O 2 CO 3 phase.
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Bakiz et al. (2010) studied this question.