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Instability of the Ionic Conductor Li6BaLa2B2O12 (B = Nb, Ta): Barium Exsolution from the Garnet Network Leading to CO2 Capture

Abstract : The instability of the two garnets Li6BaLa2B2O12 (B = Nb, Ta) has been studied on samples prepared in powder form by solid-state reaction. For this study, we coupled different techniques: powder X-ray diffraction, IR spectrometry, thermal analysis, transmission electron microscopy, and complex impedance spectroscopy. We showed that in ambient air and at low temperature (<150 °C), a spontaneous Li+/H+ exchange occurs. At higher temperature (500–700 °C), a progressive exsolution of the barium from the garnet framework is observed, leading to the formation of a second garnet, BaCO3, and a 3D cubic perovskite. To conclude this work, we studied the impact of barium exsolution on the ionic conductivity measured by complex impedance spectroscopy. We observed a significant decrease in the starting bulk conductivity (60%) when the pellet is heated at 500 °C for 5 h.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-01912565
Contributeur : Marie-Pierre Crosnier-Lopez <>
Soumis le : lundi 5 novembre 2018 - 14:51:47
Dernière modification le : jeudi 29 août 2019 - 10:40:03

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Cyrille Galven, Gwenaël Corbel, Françoise Le Berre, Marie-Pierre Crosnier-Lopez. Instability of the Ionic Conductor Li6BaLa2B2O12 (B = Nb, Ta): Barium Exsolution from the Garnet Network Leading to CO2 Capture. Inorganic Chemistry, American Chemical Society, 2016, 55 (24), pp.12872 - 12880. ⟨10.1021/acs.inorgchem.6b02238⟩. ⟨hal-01912565⟩

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