Reaction Mechanisms of Li₅La₃Ta₂O₁₂ Powder with Ambient Air: H⁺/Li⁺ Exchange with Water

Abstract:

The proton/lithium exchange property of the garnet-related lithium-ion conductors Li₅La₃Ta₂O₁₂ is shown to occur at room temperature under ambient air. The internal friction, TGA analysis, and IR spectroscopy techniques are used to investigate the reaction mechanism. XRPD analysis demonstrates the topotactic character of the exchange reaction. The water gas in ambient air is adsorbed on the grain surface and then to exchange proton for lithium ion into the garnet structure,(Li_5-xH_x)La₃Ta₂O₁₂. The H⁺/Li⁺ exchanging processes are reversible. When the measured temperature is higher over 573K, the internal friction peak gradually shifts toward lower temperature and the like garnet-like phase is recovered.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 123-127
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.123
• Online since: February 2012
• Authors: Wei Guo Wang, Qian Feng Fang, Gang Ling Hao
• Keywords: Ion Exchange, Lithium Ion, Lithium Ion Conductor, Proton

References

[1] V. Thangadurai, H. Kaack, and W. Weppner, J. Am. Ceram. Soc., Vol. 86 (2003), p.437.

[2] E. J. Cussen, Chem. Commun. 2006, p.412.

[3] A. Boulant, J. F. Bardeau and A. Jouanneaux, etc, Dalton Trans. Vol. 39 (2010), p.3968.

[4] J. Rodrguez-Carvajal, Physica (Amsterdam) Vol. 192B (1993), p.55.

[5] X.P. Wang, Q.F. Fang, Phys. Rev. B Vol. 65 (2002), p.064304.

[6] Q.F. Fang, F.J. Liang, X.P. Wang, G.G. Zhang, Mater. Sci. Eng. A Vol. 442 (2006), p.43.

[7] Q.F. Fang, X.P. Wang, G.G. Zhang, Z.J. Cheng, Phys. Status Solidi (a) Vol. 202 (2005), p.1041.

[8] X. P. Wang, W. G. Wang, Y. X. Gao, , etc, Mater. Sci. Eng. A, Vol. 521-522(2009), p.87.