Abstract
The structural characterization for Na+ Super Ionic Conductor (NASICON)-type glass ceramics of 20R2O–XZrO2–15P2O5–(65-X)SiO2 (R = Na, Li) was investigated by X-ray diffraction (XRD) and X-ray absorption fine structure to clarify the better conductive mechanism of Li-glass ceramics than that of Na-glass ceramics. The Na-glass ceramics were synthesized by heat treatment using glass material, and the Li-glass ceramics were obtained through ion exchange techniques from Na-glass ceramics. From the XRD analysis, the positive correlation between ionic conductivity and lattice parameter was identified for the Na-glass ceramics, on the other hand, there was no positive relation for Li-glass ceramics, indicating that the ion conductive mechanism cannot be explained by the lattice parameter of NASICON crystalline phase alone. The Debye–Waller factors related to the oxygen surrounding the Zr-ion for the Li-glass ceramics were higher than those for the Na-glass ceramics. The static disorder around Zr-ion may cause more weakly bonding between the Li ions and surrounding atoms, resulting in the improvement of ionic conductivity.
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Acknowledgements
The synchrotron radiation experiments were performed at BL14B2 (proposal No. 2013A1784, No. 2013B1832), at BL19B2 (proposal No. 2013B1593) with the approval of the SPring8. The author is grateful to Dr. T. Itoh (AGC Seimi Chemical Co. Ltd.) and Dr. S. Matsumoto (Okayama University) for extending technical support for the synchrotron experiments and discussions.
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Tsujimura, T. Structural characterization for alkali ion conductive phosphosilicate glass ceramics. J Mater Sci 50, 7735–7741 (2015). https://doi.org/10.1007/s10853-015-9342-0
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DOI: https://doi.org/10.1007/s10853-015-9342-0