Improved ionic conductivity of Na3+xScxZr2-xSi2PO12 (x = 0.2, 0.3, 0.4, 0.5) NASICON via optimized sintering conditions: Investigation of crystal structure, local atomic structure, and microstructure

Santhoshkumar, B and LR Khanna, D and Choudhary, MB and Lokeswara Rao, P and Ramanathan, KV and Bera, AK and Yusuf, SM and Pahari, B (2021) Improved ionic conductivity of Na3+xScxZr2-xSi2PO12 (x = 0.2, 0.3, 0.4, 0.5) NASICON via optimized sintering conditions: Investigation of crystal structure, local atomic structure, and microstructure. In: Chemical Physics Letters, 776 .

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Abstract

We report enhanced Na-ion conductivity of Na3+xScxZr2-xSi2PO12 (x = 0.2�0.5), prepared through solid-state reaction method with optimized sintering temperature of 1220 °C for 15 h. Among four compositions, Na3.4Sc0.4Zr1.6Si2PO12 offers highest total ionic conductivity of 2.6 mS/cm at 25 °C which is much higher than that of parent material. The Rietveld analysis of XRD data reveals a phase mixture of monoclinic and rhombohedral NASICON phases. NMR results indicate local disordering and a fast exchange of Na-ions between the different Na-sites. SEM observation reveals microcrack-free grain boundaries. An understanding of the underlying causes of higher conductivity has been achieved. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Chemical Physics Letters
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Department/Centre:	Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility) Division of Physical & Mathematical Sciences > Physics
Date Deposited:	04 Aug 2021 10:52
Last Modified:	04 Aug 2021 10:52
URI:	http://eprints.iisc.ac.in/id/eprint/68906

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